Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
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+  <title>googleapiclient._auth</title>
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+      <span class="breadcrumbs">
+        <a href="googleapiclient-module.html">Package&nbsp;googleapiclient</a> ::
+        Module&nbsp;_auth
+      </span>
+    </td>
+    <td>
+      <table cellpadding="0" cellspacing="0">
+        <!-- hide/show private -->
+        <tr><td align="right"><span class="options">[<a href="javascript:void(0);" class="privatelink"
+    onclick="toggle_private();">hide&nbsp;private</a>]</span></td></tr>
+        <tr><td align="right"><span class="options"
+            >[<a href="frames.html" target="_top">frames</a
+            >]&nbsp;|&nbsp;<a href="googleapiclient._auth-module.html"
+            target="_top">no&nbsp;frames</a>]</span></td></tr>
+      </table>
+    </td>
+  </tr>
+</table>
+<!-- ==================== MODULE DESCRIPTION ==================== -->
+<h1 class="epydoc">Module _auth</h1><p class="nomargin-top"><span class="codelink"><a href="googleapiclient._auth-pysrc.html">source&nbsp;code</a></span></p>
+<pre class="literalblock">
+Helpers for authentication using oauth2client or google-auth.
+
+</pre>
+
+<!-- ==================== FUNCTIONS ==================== -->
+<a name="section-Functions"></a>
+<table class="summary" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Functions</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-Functions"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a name="default_credentials"></a><span class="summary-sig-name">default_credentials</span>()</span><br />
+      Returns Application Default Credentials.</td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="googleapiclient._auth-pysrc.html#default_credentials">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a href="googleapiclient._auth-module.html#with_scopes" class="summary-sig-name">with_scopes</a>(<span class="summary-sig-arg">credentials</span>,
+        <span class="summary-sig-arg">scopes</span>)</span><br />
+      Scopes the credentials if necessary.</td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="googleapiclient._auth-pysrc.html#with_scopes">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+      <table width="100%" cellpadding="0" cellspacing="0" border="0">
+        <tr>
+          <td><span class="summary-sig"><a href="googleapiclient._auth-module.html#authorized_http" class="summary-sig-name">authorized_http</a>(<span class="summary-sig-arg">credentials</span>)</span><br />
+      Returns an http client that is authorized with the given credentials.</td>
+          <td align="right" valign="top">
+            <span class="codelink"><a href="googleapiclient._auth-pysrc.html#authorized_http">source&nbsp;code</a></span>
+            
+          </td>
+        </tr>
+      </table>
+      
+    </td>
+  </tr>
+</table>
+<!-- ==================== VARIABLES ==================== -->
+<a name="section-Variables"></a>
+<table class="summary" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Variables</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-Variables"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="HAS_GOOGLE_AUTH"></a><span class="summary-name">HAS_GOOGLE_AUTH</span> = <code title="False">False</code>
+    </td>
+  </tr>
+<tr>
+    <td width="15%" align="right" valign="top" class="summary">
+      <span class="summary-type">&nbsp;</span>
+    </td><td class="summary">
+        <a name="HAS_OAUTH2CLIENT"></a><span class="summary-name">HAS_OAUTH2CLIENT</span> = <code title="False">False</code>
+    </td>
+  </tr>
+</table>
+<!-- ==================== FUNCTION DETAILS ==================== -->
+<a name="section-FunctionDetails"></a>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr bgcolor="#70b0f0" class="table-header">
+  <td colspan="2" class="table-header">
+    <table border="0" cellpadding="0" cellspacing="0" width="100%">
+      <tr valign="top">
+        <td align="left"><span class="table-header">Function Details</span></td>
+        <td align="right" valign="top"
+         ><span class="options">[<a href="#section-FunctionDetails"
+         class="privatelink" onclick="toggle_private();"
+         >hide private</a>]</span></td>
+      </tr>
+    </table>
+  </td>
+</tr>
+</table>
+<a name="with_scopes"></a>
+<div>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr><td>
+  <table width="100%" cellpadding="0" cellspacing="0" border="0">
+  <tr valign="top"><td>
+  <h3 class="epydoc"><span class="sig"><span class="sig-name">with_scopes</span>(<span class="sig-arg">credentials</span>,
+        <span class="sig-arg">scopes</span>)</span>
+  </h3>
+  </td><td align="right" valign="top"
+    ><span class="codelink"><a href="googleapiclient._auth-pysrc.html#with_scopes">source&nbsp;code</a></span>&nbsp;
+    </td>
+  </tr></table>
+  
+  <pre class="literalblock">
+Scopes the credentials if necessary.
+
+Args:
+    credentials (Union[
+        google.auth.credentials.Credentials,
+        oauth2client.client.Credentials]): The credentials to scope.
+    scopes (Sequence[str]): The list of scopes.
+
+Returns:
+    Union[google.auth.credentials.Credentials,
+        oauth2client.client.Credentials]: The scoped credentials.
+
+</pre>
+  <dl class="fields">
+  </dl>
+</td></tr></table>
+</div>
+<a name="authorized_http"></a>
+<div>
+<table class="details" border="1" cellpadding="3"
+       cellspacing="0" width="100%" bgcolor="white">
+<tr><td>
+  <table width="100%" cellpadding="0" cellspacing="0" border="0">
+  <tr valign="top"><td>
+  <h3 class="epydoc"><span class="sig"><span class="sig-name">authorized_http</span>(<span class="sig-arg">credentials</span>)</span>
+  </h3>
+  </td><td align="right" valign="top"
+    ><span class="codelink"><a href="googleapiclient._auth-pysrc.html#authorized_http">source&nbsp;code</a></span>&nbsp;
+    </td>
+  </tr></table>
+  
+  <pre class="literalblock">
+Returns an http client that is authorized with the given credentials.
+
+Args:
+    credentials (Union[
+        google.auth.credentials.Credentials,
+        oauth2client.client.Credentials]): The credentials to use.
+
+Returns:
+    Union[httplib2.Http, google_auth_httplib2.AuthorizedHttp]: An
+        authorized http client.
+
+</pre>
+  <dl class="fields">
+  </dl>
+</td></tr></table>
+</div>
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