Bump default JRuby version in the POM to 1.5.1
Bump default JRuby version in the POM to 1.5.1

jruby/jruby-rack,atambo/jruby-rack,jruby/jruby-rack,jruby/jruby-rack,janrain/jruby-rack,janrain/jruby-rack,atambo/jruby-rack,atambo/jruby-rack,jhstatewide/jruby-rack,jhstatewide/jruby-rack,atambo/jruby-rack,jruby/jruby-rack,jruby/jruby-rack,janrain/jruby-rack,jhstatewide/jruby-rack,janrain/jruby-rack,jhstatewide/jruby-rack,jruby/jruby-rack