JRuby Embed OSGi support

Extends the jruby.embed APIs. Access classes, ruby and libraries contained in OSGi bundles.

Example: use EclipseRT Web Starter Kit to run some ruby servlets and access some java objects.

This code was originally developed by Intalio.

## org.jruby.embed.osgi.OSGiScriptingContainer extends ScriptingContainer

Java code in an OSGi bundle:

          OSGiScriptingContainer container = new OSGiScriptingContainer();
          container.runScriptlet(bundle, "/ruby/extend_MyClass.rb")

The bundle is lazily added to JRuby’s ClassPath.

where 'extend_MyClass.rb’ reads:

          class Java::OrgJrubyOsgiTestSample::MyClass
          def say_hello
          puts "hello"
          end
          end

It is also possible to add OSGi bundles to JRuby’s ClassPath from java:

          container.addToClassPath(bundle)

## require 'bundle:/bundle.symbolic.name’

Define ruby libraries contained in an osgi bundle:

          require 'osgibundle:/org.jruby.embed.osgi.test.samplebundle'
          class Java::OrgJrubyOsgiTestSamplebundle::MyOtherClass
          def say_hello_as_well
          puts "hello_as_well"
          end
          end

Access a ruby file inside a bundle:

          require 'osgibundle:/org.jruby.embed.osgi.test/ruby/extend_MyClass.rb'