Travis config for Ruby 2.0.0, remove ruby-head

Author: sodabrew

.travis.yml

@@ -3,10 +3,10 @@ rvm:
   - 1.8.7
   - 1.9.2
   - 1.9.3
+  - 2.0.0
   - ree
   - rbx-18mode
   - rbx-19mode
-  - ruby-head
 bundler_args: --without benchmarks
 script:
   - bundle exec rake