DELTASPIKE-660 added OSGi requirements and capabilities for JPA 

...and dependencies

Widened range of javax.persistence* imports to cover JPA 2.0 and JPA 2.1
, 
Supersedes and simplifies pull request #9

Tested with Pax CDI 1.0.0-SNAPSHOT, Weld 2.2.6, OpenWebBeans 1.5.0-SNAPSHOT.