[eclipselink-dev] patch for 371950 - Metadata caching checked in

[Christopher Delahunt <christopher.delahunt@xxxxxxxxxx>]

371950 - Metadata caching
https://bugs.eclipse.org/bugs/show_bug.cgi?id=371950

Design doc:
 http://wiki.eclipse.org/EclipseLink/DesignDocs/371950

Checked into main

- Allows serializing an initialized Project created from JPA metadata so 
that it can be deserialized and used within a session
- removed transient from attributes required for project initialization 
and makes some referenced classes serializable.

-adds MetadataCachingTestSuite to the advanced model to test basic 
writing, reading and intialization of a project serialized out to a file.

Reviewed by Guy Pelletier
Core LRG and JPA FullRegressionTestSuite passed