Update Jena provider for use new Bulk Loading calls

* Update for using new Bulk Loading calls
* Update for support Jena 2.12.0 (note Jena 2.12.0 uses JDK1.7)
* Update makefile for compile using JDK1.7
* Fix for avoid Statement leaks with old versions of Virtuoso JDBC driver
Merge branch 'develop/6' into develop/7