Release v1.6.0 (#324)

* Update version and changelog for v1.6.0
* Update docs
diff --git a/docs/epy/googleapiclient.channel.Channel-class.html b/docs/epy/googleapiclient.channel.Channel-class.html
index 1eff011..2292f91 100644
--- a/docs/epy/googleapiclient.channel.Channel-class.html
+++ b/docs/epy/googleapiclient.channel.Channel-class.html
@@ -59,10 +59,10 @@
 <h1 class="epydoc">Class Channel</h1><p class="nomargin-top"><span class="codelink"><a href="googleapiclient.channel-pysrc.html#Channel">source&nbsp;code</a></span></p>
 <center>
 <center>  <map id="uml_class_diagram_for_googleap_2" name="uml_class_diagram_for_googleap_2">
-<area shape="rect" id="node1_3" href="googleapiclient.channel.Channel-class.html#__init__" title="Create a new Channel." alt="" coords="17,40,627,60"/>
-<area shape="rect" id="node1_4" href="googleapiclient.channel.Channel-class.html#body" title="Build a body from the Channel." alt="" coords="17,60,627,80"/>
-<area shape="rect" id="node1_5" href="googleapiclient.channel.Channel-class.html#update" title="Update a channel with information from the response of watch()." alt="" coords="17,80,627,100"/>
-<area shape="rect" id="node1" href="googleapiclient.channel.Channel-class.html" title="A Channel for notifications." alt="" coords="5,6,638,106"/>
+<area shape="rect" id="node1_3" href="googleapiclient.channel.Channel-class.html#__init__" title="Create a new Channel." alt="" coords="17,36,633,55"/>
+<area shape="rect" id="node1_4" href="googleapiclient.channel.Channel-class.html#body" title="Build a body from the Channel." alt="" coords="17,55,633,73"/>
+<area shape="rect" id="node1_5" href="googleapiclient.channel.Channel-class.html#update" title="Update a channel with information from the response of watch()." alt="" coords="17,73,633,92"/>
+<area shape="rect" id="node1" href="googleapiclient.channel.Channel-class.html" title="A Channel for notifications." alt="" coords="5,5,645,99"/>
 </map>
   <img src="uml_class_diagram_for_googleap_2.gif" alt='' usemap="#uml_class_diagram_for_googleap_2" ismap="ismap" class="graph-without-title" />
 </center>
@@ -376,7 +376,7 @@
 <table border="0" cellpadding="0" cellspacing="0" width="100%%">
   <tr>
     <td align="left" class="footer">
-    Generated by Epydoc 3.0.1 on Tue Nov  1 17:02:49 2016
+    Generated by Epydoc 3.0.1 on Thu Jan  5 12:55:02 2017
     </td>
     <td align="right" class="footer">
       <a target="mainFrame" href="http://epydoc.sourceforge.net"