.travis.yml in polytrix-0.1.0.pre vs .travis.yml in polytrix-0.1.0

@@ -1,11 +1,12 @@
 before_install:
- - sudo add-apt-repository ppa:cwchien/gradle
+ - sudo add-apt-repository -y ppa:cwchien/gradle
  - sudo apt-get update -qq
  - sudo apt-get install -qq gradle
 rvm:
   - 1.9.3
   - 2.0.0
   - 2.1.0
+  - jruby
 allow_failures:
   rvm:
     - 1.9.3 # YAML formatting differs