Added ajv to implementations

Author: epoberezkin

implementations.html

@@ -16,10 +16,11 @@
 </div>
 
 <div class="show-hide" data-target="validator-list"></div>
-<h2>Validators (25)</h2>
+<h2>Validators (33)</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> for Node.js and the browser - <em>supports version 4, validation keywords and $data reference from <a href="https://github.com/json-schema/json-schema/wiki/v5-Proposals">version 5 proposals</a></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>
@@ -29,7 +30,7 @@ <h3>JavaScript</h3>
 		<li><a id="link-impl-kriszyp-jsonschema" href="http://github.com/kriszyp/json-schema">json-schema</a> (AFL or BSD) as part of <a id="link-impl-persvr" href="http://www.persvr.org/">Persevere</a></li>
 		<li><a id="link-impl-schema-js" href="https://github.com/akidee/schema.js">schema.js</a> (MIT)</li>
 		<li><a id="link-impl-json-gate" href="https://github.com/oferei/json-gate">json-gate</a> (MIT)</li>
-        <li><a id="link-impl-jsen" href="https://github.com/bugventure/jsen">JSEN</a> for Node.js - <em>supports version 4</em> (MIT)</li>
+		<li><a id="link-impl-jsen" href="https://github.com/bugventure/jsen">JSEN</a> for Node.js - <em>supports version 4</em> (MIT)</li>
 	</ul>
 
 	<h3>Java</h3>