Jruby standalone war support

I've added support to build a (standalone) WAR archive that can be run in java using warbler. 
Currently you have to edit the KibanaConfig.rb either before packaging the WAR or afterwards by updating in in the WAR. 
Creation and running of WAR tested on Ubuntu using Ruby 1.9.3 and OpenJDK 1.6.0_24.
Running tested on RHEL 5.8, Oracle Java 7 and Windows XP, Oracle Java 1.6.