.travis.yml in mbj-assets-0.0.4 vs .travis.yml in mbj-assets-0.0.5

@@ -2,9 +2,11 @@
 script: 'bundle exec rake ci'
 rvm:
   - 1.9.2
   - 1.9.3
   - 2.0.0
-  - ruby-head
   - jruby-19mode
   - jruby-head
   - rbx-19mode
+matrix:
+  allowed_failures:
+    - rvm: ruby-head