Added json-schema-validator

Draft 3 based validator written in python
https://github.com/zyga/json-schema-validator

Author: nickl-

implementations.html

@@ -69,7 +69,8 @@ <h2>Haskell</h2>
 <h2>Python</h2>
 
 <ul>
-    <li><a href="https://github.com/Julian/jsonschema">jsonschema</a>.</li>
+    <li><a href="https://github.com/Julian/jsonschema">jsonschema</a>;</li>
+    <li><a href="https://github.com/zyga/json-schema-validator">json-schema-validator</a>.</li>
 </ul>
 
                 </div> <!-- style="padding-left:40px; margin-right:-40px;" class="span4" -->