Remove old allow failures builds, not needed

Author: JonRowe

ci/.travis.yml

@@ -17,19 +17,13 @@ rvm:
   - 1.9.3
   - 2.0.0
   - ree
-  - rbx-3
-  - jruby-head
   - jruby-1.7
 env:
   - JRUBY_OPTS='--dev'
 matrix:
   include:
     - rvm: jruby-1.7
       env: JRUBY_OPTS='--dev --1.8'
-  allow_failures:
-    - rvm: jruby-head
-    - rvm: ruby-head
-    - rvm: rbx-3
   fast_finish: true
 branches:
   only: