Regen all docs. (#700)

* Stop recursing if discovery == {}

* Generate docs with 'make docs'.
diff --git a/docs/epy/googleapiclient.discovery-module.html b/docs/epy/googleapiclient.discovery-module.html
index 26c97ed..4cf0bba 100644
--- a/docs/epy/googleapiclient.discovery-module.html
+++ b/docs/epy/googleapiclient.discovery-module.html
@@ -132,7 +132,7 @@
       <table width="100%" cellpadding="0" cellspacing="0" border="0">
         <tr>
           <td><span class="summary-sig"><a href="googleapiclient.discovery-module.html#fix_method_name" class="summary-sig-name">fix_method_name</a>(<span class="summary-sig-arg">name</span>)</span><br />
-      Fix method names to avoid reserved word conflicts.</td>
+      Fix method names to avoid '$' characters and reserved word conflicts.</td>
           <td align="right" valign="top">
             <span class="codelink"><a href="googleapiclient.discovery-pysrc.html#fix_method_name">source&nbsp;code</a></span>
             
@@ -194,7 +194,8 @@
           <td><span class="summary-sig"><a href="googleapiclient.discovery-module.html#_retrieve_discovery_doc" class="summary-sig-name" onclick="show_private();">_retrieve_discovery_doc</a>(<span class="summary-sig-arg">url</span>,
         <span class="summary-sig-arg">http</span>,
         <span class="summary-sig-arg">cache_discovery</span>,
-        <span class="summary-sig-arg">cache</span>=<span class="summary-sig-default">None</span>)</span><br />
+        <span class="summary-sig-arg">cache</span>=<span class="summary-sig-default">None</span>,
+        <span class="summary-sig-arg">developerKey</span>=<span class="summary-sig-default">None</span>)</span><br />
       Retrieves the discovery_doc from cache or the internet.</td>
           <td align="right" valign="top">
             <span class="codelink"><a href="googleapiclient.discovery-pysrc.html#_retrieve_discovery_doc">source&nbsp;code</a></span>
@@ -605,13 +606,14 @@
   </tr></table>
   
   <pre class="literalblock">
-Fix method names to avoid reserved word conflicts.
+Fix method names to avoid '$' characters and reserved word conflicts.
 
 Args:
   name: string, method name.
 
 Returns:
-  The name with an '_' appended if the name is a reserved word.
+  The name with '_' appended if the name is a reserved word and '$' 
+  replaced with '_'. 
 
 </pre>
   <dl class="fields">
@@ -720,7 +722,8 @@
   <h3 class="epydoc"><span class="sig"><span class="sig-name">_retrieve_discovery_doc</span>(<span class="sig-arg">url</span>,
         <span class="sig-arg">http</span>,
         <span class="sig-arg">cache_discovery</span>,
-        <span class="sig-arg">cache</span>=<span class="sig-default">None</span>)</span>
+        <span class="sig-arg">cache</span>=<span class="sig-default">None</span>,
+        <span class="sig-arg">developerKey</span>=<span class="sig-default">None</span>)</span>
   </h3>
   </td><td align="right" valign="top"
     ><span class="codelink"><a href="googleapiclient.discovery-pysrc.html#_retrieve_discovery_doc">source&nbsp;code</a></span>&nbsp;
@@ -1376,7 +1379,7 @@
 <table border="0" cellpadding="0" cellspacing="0" width="100%%">
   <tr>
     <td align="left" class="footer">
-    Generated by Epydoc 3.0.1 on Fri Jun 14 13:09:01 2019
+    Generated by Epydoc 3.0.1 on Fri Jun 14 15:57:27 2019
     </td>
     <td align="right" class="footer">
       <a target="mainFrame" href="http://epydoc.sourceforge.net"