Add OSGi Test
Upgrade JRuby to reference OSGi 4.3

Now, if JRuby is running in an OSGi 4.3 container, it will use the
more straightforward (and standard) BundleWiring to find the
ClassLoader, rather than the old reflection tricks.  If running in
an earlier container, will continue to use the old method.
Merge branch 'feature/add-osgi-test'

Conflicts:
	.classpath
	nbproject/project.xml
Update parent artifact version
Merge branch 'master' of https://github.com/ajuckel/jruby
Restore frozen checks to more direct instance-var setting paths.