Add ruby 2.2, ruby/jruby-head and drop rubinius in travis.

Allow ruby/jruby-head to fail.

Author: jrafanie

.travis.yml

@@ -3,5 +3,11 @@ rvm:
   - "1.9.3"
   - "2.0"
   - "2.1"
-#  - jruby-19mode # JRuby in 1.9 mode
-  - rbx-2
+  - "2.2"
+  - ruby-head
+  - jruby-head
+matrix:
+  allow_failures:
+    - rvm: ruby-head
+    - rvm: jruby-head
+  fast_finish: true