DATAREST-185 - Upgraded Spring Data dependencies.

Upgraded to Spring Data Neo4j 3.0 and Spring Data Gemfire 1.4 snapshots.
DATAREST-193 - Prepare 2.0 M1 release.

Updated changelog. Upgraded to milestone dependencies of Codd.
DATAREST-193 - Release version 2.0 M1.
DATAREST-193 - Prepare next development iteration.
This commit adds the Denormalized annotation to allow one to control wich field are denormalized and which are only referenced.
This commit make spring-data-rest returns 404 when delete an inexistant resource.
Adding some ignored files to the git repository