Add Jruby

Include json with rbx

Author: Chris Harper

.travis.yml

@@ -1,4 +1,5 @@
 rvm:
   - 1.8.7
   - 1.9.2
+  - jruby
   - rbx-2.0

Gemfile

@@ -8,5 +8,5 @@ group :test do
   gem "mocha", "~> 0.9.7"
   gem "leftright", :platforms => :mri_18
   gem "yajl-ruby", "~>0.8.2", :platforms => :mri
-  gem "json", "~>1.5.3", :platforms => :jruby
+  gem "json", "~>1.5.3", :platforms => [:jruby, :rbx]
 end