Testing the JRuby OSGI bridge
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1. Build the jruby OSGI module and copy the bundle to /var/tmp/killbill-osgi-bundles-jruby-*-jar-with-dependencies.jar 
2. Build a ruby plugin, e.g. killbill-paypal-express:

    rake killbill:clean
    rake build
    rake killbill:package

3. Copy the built tree to the bundles directory:

    mkdir -p /var/tmp/bundles/ruby
    mv pkg/killbill-paypal-express-*/killbill-paypal-express /var/tmp/bundles/ruby/
