Don't need extra travis allowed failures

Author: durran

.travis.yml

@@ -5,9 +5,7 @@ rvm:
   - 2.0.0
   - 2.1.5
   - 2.2.0
-  - ruby-head
   - jruby-19mode
-  - jruby-head
 
 jdk:
   - oraclejdk7
@@ -43,9 +41,6 @@ branches:
     - 1.x-stable
 
 matrix:
-  allow_failures:
-    - rvm: ruby-head
-    - rvm: jruby-head
   exclude:
     - rvm: 1.9.3
       jdk: openjdk7