Merge pull request #146 from ctasada/issue132

Issue 132 - Java 7 Compilation Bug tested for compilation and smoke test
Adding a Production worthy sample configuration
do a
   $ bin/voldemort-prod-server.sh config/prod_single_node_cluster
to get started
Reverting back change to on wire protocol for update metadata
to preseve backwards compatibility
Check that zone value for a node is not null
Added functionality to get store schema

Example:
==========

 curl http://localhost:8080/schemata/dGVzdA==
{"key-serializer": "SerializerDefinition(name = string, schema-info =
{}, compression = null)", "value-serializer": "SerializerDefinition(name
= string, schema-info = {}, compression = null)"}
Cleaned up code based on Vinoth's review
Adding sample configs for Voldemort Coordinator
Implement metadata bootstrapping for Java Rest Client
Bug fix in RESTErrorHandler - adding the right content length in the response header
Update CONTRIBUTORS

Long missing update for the current Voldemort Team at Linkedin