docs: prepared for first ZPLv2 training class

Mostly just removing all of the -2, -4, and -5 suffixes. We have
documentation tagged for previous zenpacklib releases. People can always
go back and look at documentation for any version they want.

README.html

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+<style>
+div.thumbnail {
+    clear: right;
+    float: right;
+    margin: 0 0 10px 10px;
+    padding: 0px;
+    width: 320px;
+    font-size: small;
+    font-style: italic;
+}
+
+br.clear {
+    clear: right;
+}
+
+dd {
+    font-size: smaller;
+}
+</style>
+
+<h1 id="title">ZenPackLib ZenPack</h1>
+<p>Documentation for ZenPackLib can be found at <a href="https://zenpack-sdk.zenoss.com/">the ZenPack SDK site</a>.</p>
+
+<h2 id="releases">Releases</h2>
+<dl id="releases-2.0.1">
+	<dt>Version 2.0.1 <a class="external" rel="nofollow" href="http://wiki.zenoss.org/download/zenpacks/ZenPacks.zenoss.ZenPackLib/2.0.1/ZenPacks.zenoss.ZenPackLib-2.0.1.egg">Download</a></dt>
+	<dd>Released: 2017-01-16</dd>
+	<dd>Compatible with Zenoss 4.2 - 5.2.</dd>
+</dl>
+
+<h2 id="releases-older">Older (non-ZenPack) Releases</h2>
+<p>Versions of zenpacklib before 2.0 were a single Python file (zenpacklib.py) instead of a ZenPack. The following releases are of this file, not a ZenPack.</p>
+
+<dl id="releases-1.1.2">
+	<dt>Version 1.1.2 <a class="external" rel="nofollow" href="https://raw.githubusercontent.com/zenoss/ZenPacks.zenoss.ZenPackLib/1.1.2/zenpacklib.py">Download</a></dt>
+	<dd>Released: 2016-11-03</dd>
+	<dd>Compatible with Zenoss 4.2 - 5.2.</dd>
+</dl>
+
+<dl id="releases-1.0.13">
+	<dt>Version 1.0.13 <a class="external" rel="nofollow" href="https://raw.githubusercontent.com/zenoss/ZenPacks.zenoss.ZenPackLib/1.0.13/zenpacklib.py">Download</a></dt>
+	<dd>Released: 2016-06-09</dd>
+	<dd>Comptible with Zenoss 4.2 - 5.2.</dd>
+</dl>

README.md

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+Documentation for ZenPackLib can be found at [the ZenPack SDK site](https://zenpack-sdk.zenoss.com/).