added ajv validator to software page, closes json-schema-org#170

Author: epoberezkin

implementations.html

@@ -38,10 +38,11 @@ <h1>json-schema.org</h1>
 </div>
 
 <div class="show-hide" data-target="validator-list"></div>
-<h2>Validators (28)</h2>
+<h2>Validators (32)</h2>
 <div class="block" id="validator-list">
 	<h3>JavaScript</h3>
 	<ul>
+		<li><a id="link-impl-ajv" href="https://github.com/epoberezkin/ajv">ajv</a> - <em>supports version 4</em> (MIT)</li>
 		<li><a id="link-impl-is-my-json-valid" href="https://github.com/mafintosh/is-my-json-valid">is-my-json-valid</a> - <em>supports version 4</em> (MIT)</li>
 		<li><a id="link-impl-tv4" href="http://geraintluff.github.com/tv4/">tv4</a> - <em>supports version 4</em> (Public Domain)</li>
 		<li><a id="link-impl-jayschema" href="https://github.com/natesilva/jayschema">JaySchema</a> for Node.js - <em>supports version 4</em> (BSD)</li>
@@ -200,7 +201,7 @@ <h3>JavaScript</h3>
 </div>
 
 <div class="show-hide" data-target="hyper-tools-list"></div>
-<h2>Hyper-schema handling (1)</h2>
+<h2>Hyper-schema handling (2)</h2>
 <div class="block" id="hyper-tools-list">
 	<h3>JavaScript</h3>
 	<ul>
@@ -214,7 +215,7 @@ <h3>Ruby</h3>
 </div>
 
 <div class="show-hide" data-target="documentation-list"></div>
-<h2>Documentation generation (2)</h2>
+<h2>Documentation generation (3)</h2>
 <div class="block" id="documentation-list">
 	<h3>JavaScript</h3>
 	<ul>