lib!: refactor HTTP bindings and specifications (#165)

This is a breaking change.

This commit makes a number of changes to the HTTP bindings code in an attempt
to simplify its usage and implementation. From a very high level, this inverts
the existing dependencies.

As an example, consider `lib/bindings/http/receiver_structured_1.js`.
https://github.com/cloudevents/sdk-javascript/blob/v1.0.0/lib/bindings/http/receiver_structured_0_3.js

This class instantiates `lib/bindings/http/receiver_structured.js` and delegates
its function invokations to it. This had the effect of requiring a user to know what
event versions they would be receiving. And for me personally was a little confusing
as a maintainer.

The change introduced here reverses that logic, so that the version agnostic receiver
is what the user instantiates. It instantiates the approrpiate version of a specific
receiever and delegates to it - reversing the dependencies.

I've also moved all of the top level directories related to HTTP versions into
`lib/bindings/http/v1` and `lib/bindings/http/v03` and generally done some rearranging
to make the repository structure cleaner and more organized.

Signed-off-by: Lance Ball <lball@redhat.com>

docs/CloudEvent.html

@@ -73,7 +73,7 @@ <h3>
 
 
 
-    <h3>Classes</h3><ul><li id="CloudEvent-nav"><a href="CloudEvent.html">CloudEvent</a><ul class='methods'><li data-type="method" id="CloudEvent-addExtension-nav"><a href="CloudEvent.html#addExtension">addExtension</a></li><li data-type="method" id="CloudEvent-data-nav"><a href="CloudEvent.html#data">data</a></li><li data-type="method" id="CloudEvent-dataContenttype-nav"><a href="CloudEvent.html#dataContenttype">dataContenttype</a></li><li data-type="method" id="CloudEvent-format-nav"><a href="CloudEvent.html#format">format</a></li><li data-type="method" id="CloudEvent-getData-nav"><a href="CloudEvent.html#getData">getData</a></li><li data-type="method" id="CloudEvent-getDataContenttype-nav"><a href="CloudEvent.html#getDataContenttype">getDataContenttype</a></li><li data-type="method" id="CloudEvent-getExtensions-nav"><a href="CloudEvent.html#getExtensions">getExtensions</a></li><li data-type="method" id="CloudEvent-getFormats-nav"><a href="CloudEvent.html#getFormats">getFormats</a></li><li data-type="method" id="CloudEvent-getId-nav"><a href="CloudEvent.html#getId">getId</a></li><li data-type="method" id="CloudEvent-getSource-nav"><a href="CloudEvent.html#getSource">getSource</a></li><li data-type="method" id="CloudEvent-getSpecversion-nav"><a href="CloudEvent.html#getSpecversion">getSpecversion</a></li><li data-type="method" id="CloudEvent-getTime-nav"><a href="CloudEvent.html#getTime">getTime</a></li><li data-type="method" id="CloudEvent-getType-nav"><a href="CloudEvent.html#getType">getType</a></li><li data-type="method" id="CloudEvent-id-nav"><a href="CloudEvent.html#id">id</a></li><li data-type="method" id="CloudEvent-source-nav"><a href="CloudEvent.html#source">source</a></li><li data-type="method" id="CloudEvent-time-nav"><a href="CloudEvent.html#time">time</a></li><li data-type="method" id="CloudEvent-toString-nav"><a href="CloudEvent.html#toString">toString</a></li><li data-type="method" id="CloudEvent-type-nav"><a href="CloudEvent.html#type">type</a></li></ul></li><li id="HTTPReceiver-nav"><a href="HTTPReceiver.html">HTTPReceiver</a><ul class='methods'><li data-type="method" id="HTTPReceiver-accept-nav"><a href="HTTPReceiver.html#accept">accept</a></li></ul></li></ul>
+    <h3>Classes</h3><ul><li id="BinaryHTTPEmitter-nav"><a href="BinaryHTTPEmitter.html">BinaryHTTPEmitter</a><ul class='methods'><li data-type="method" id="BinaryHTTPEmitter-emit-nav"><a href="BinaryHTTPEmitter.html#emit">emit</a></li></ul></li><li id="BinaryHTTPReceiver-nav"><a href="BinaryHTTPReceiver.html">BinaryHTTPReceiver</a><ul class='methods'><li data-type="method" id="BinaryHTTPReceiver-check-nav"><a href="BinaryHTTPReceiver.html#check">check</a></li><li data-type="method" id="BinaryHTTPReceiver-parse-nav"><a href="BinaryHTTPReceiver.html#parse">parse</a></li></ul></li><li id="CloudEvent-nav"><a href="CloudEvent.html">CloudEvent</a><ul class='methods'><li data-type="method" id="CloudEvent-addExtension-nav"><a href="CloudEvent.html#addExtension">addExtension</a></li><li data-type="method" id="CloudEvent-data-nav"><a href="CloudEvent.html#data">data</a></li><li data-type="method" id="CloudEvent-dataContenttype-nav"><a href="CloudEvent.html#dataContenttype">dataContenttype</a></li><li data-type="method" id="CloudEvent-format-nav"><a href="CloudEvent.html#format">format</a></li><li data-type="method" id="CloudEvent-getData-nav"><a href="CloudEvent.html#getData">getData</a></li><li data-type="method" id="CloudEvent-getDataContenttype-nav"><a href="CloudEvent.html#getDataContenttype">getDataContenttype</a></li><li data-type="method" id="CloudEvent-getExtensions-nav"><a href="CloudEvent.html#getExtensions">getExtensions</a></li><li data-type="method" id="CloudEvent-getFormats-nav"><a href="CloudEvent.html#getFormats">getFormats</a></li><li data-type="method" id="CloudEvent-getId-nav"><a href="CloudEvent.html#getId">getId</a></li><li data-type="method" id="CloudEvent-getSource-nav"><a href="CloudEvent.html#getSource">getSource</a></li><li data-type="method" id="CloudEvent-getSpecversion-nav"><a href="CloudEvent.html#getSpecversion">getSpecversion</a></li><li data-type="method" id="CloudEvent-getTime-nav"><a href="CloudEvent.html#getTime">getTime</a></li><li data-type="method" id="CloudEvent-getType-nav"><a href="CloudEvent.html#getType">getType</a></li><li data-type="method" id="CloudEvent-id-nav"><a href="CloudEvent.html#id">id</a></li><li data-type="method" id="CloudEvent-source-nav"><a href="CloudEvent.html#source">source</a></li><li data-type="method" id="CloudEvent-time-nav"><a href="CloudEvent.html#time">time</a></li><li data-type="method" id="CloudEvent-toString-nav"><a href="CloudEvent.html#toString">toString</a></li><li data-type="method" id="CloudEvent-type-nav"><a href="CloudEvent.html#type">type</a></li></ul></li><li id="HTTPEmitter-nav"><a href="HTTPEmitter.html">HTTPEmitter</a><ul class='methods'><li data-type="method" id="HTTPEmitter-headers-nav"><a href="HTTPEmitter.html#headers">headers</a></li><li data-type="method" id="HTTPEmitter-send-nav"><a href="HTTPEmitter.html#send">send</a></li></ul></li><li id="HTTPReceiver-nav"><a href="HTTPReceiver.html">HTTPReceiver</a><ul class='methods'><li data-type="method" id="HTTPReceiver-accept-nav"><a href="HTTPReceiver.html#accept">accept</a></li></ul></li><li id="StructuredHTTPEmitter-nav"><a href="StructuredHTTPEmitter.html">StructuredHTTPEmitter</a><ul class='methods'><li data-type="method" id="StructuredHTTPEmitter-emit-nav"><a href="StructuredHTTPEmitter.html#emit">emit</a></li></ul></li><li id="ValidationError-nav"><a href="ValidationError.html">ValidationError</a></li></ul>
   </nav>
 
   <div id="main">
@@ -119,7 +119,7 @@ <h2>Constructor</h2>
       </svg>
     </a>
     <h4 class="name" id="CloudEvent">
-      <span class="type-signature"></span>new CloudEvent<span class="signature">(UserSpec<span class="signature-attributes">opt</span>, UserFormatter<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span>
+      <span class="type-signature"></span>new CloudEvent<span class="signature">(userSpec<span class="signature-attributes">opt</span>, userFormatter<span class="signature-attributes">opt</span>)</span><span class="type-signature"></span>
     </h4>
   </span>
 
@@ -163,7 +163,7 @@ <h5>Parameters:</h5>
 
       <tr>
 
-          <td class="name"><code>UserSpec</code></td>
+          <td class="name"><code>userSpec</code></td>
 
 
         <td class="type">
@@ -202,7 +202,7 @@ <h5>Parameters:</h5>
 
       <tr>
 
-          <td class="name"><code>UserFormatter</code></td>
+          <td class="name"><code>userFormatter</code></td>
 
 
         <td class="type">
@@ -397,7 +397,7 @@ <h5>Parameters:</h5>
 
 
         <td class="description last">
-          <p>the name of the exteneion attribute</p>
+          <p>the name of the extension attribute</p>
 
         </td>
       </tr>
@@ -843,7 +843,7 @@ <h4 class="name" id="format">
 
 
   <div class="description">
-    <p>Format the CloudEvent as JSON. Validates the event according
+    <p>Formats the CloudEvent as JSON. Validates the event according
 to the CloudEvent specification and throws an exception if
 it's invalid.</p>
   </div>