Disallow all failures

Author: tamird

.travis.yml

@@ -40,19 +40,14 @@ rvm:
   - 2.1
   - 2.2
   - ree
+  - rbx-2
 matrix:
-  allow_failures:
-    - env: DB=mysql57
-    - rvm: rbx-2
-    - os: osx
   include:
     - rvm: 2.0.0
       env: DB=mariadb55
     - rvm: 2.0.0
       env: DB=mariadb10
     - rvm: 2.0.0
       env: DB=mysql57
-    - rvm: rbx-2
-      env: RBXOPT=-Xgc.honor_start=true
     - rvm: 2.0.0
       os: osx