gem bundling refactor

update jruby jar to 1.7.15

pinned i18n dependency and cosmetic cleanups

new generated Gemfile lock

refactor gem bundling using stadalone setup & use standard Gemfile with gemspec

update to jruby 1.7.16 and remove jar-dependencies, bouncy-castle-java, jruby-openssl from gemspec

get ready for future plugins mechanism
allow user@hostname in commonapache log
Closes #1500 #1736
ElasticSearch output plugin to support multiple hosts and enhance stability. (by Hao Chen)
Closes #1791
Use v1.9.3 for gem ci_reporter. Fixes Jenkins tests