.travis.yml in rack-blogengine-0.2.1 vs .travis.yml in rack-blogengine-0.2.2

@@ -1,8 +1,15 @@
 language: ruby
+cache: bundler
+
 rvm:
-  - 1.8.7
   - 1.9.3
   - 2.0.0
   - 2.1.0
   - jruby
-  - rbx
+  - rbx
+
+matrix:
+  allow_failures:
+    - rvm: rbx
+    - rvm: jruby
+    - rvm: ruby-head
\ No newline at end of file