.travis.yml in tweetstream-2.3.0 vs .travis.yml in tweetstream-2.4.0

@@ -1,10 +1,16 @@
+bundler_args: --without development
 language: ruby
 matrix:
   allow_failures:
     - rvm: ruby-head
 rvm:
-  - rbx-19mode
   - 1.8.7
   - 1.9.2
   - 1.9.3
   - ruby-head
+gemfile:
+  - Gemfile
+  - gemfiles/twitter4_0.gemfile
+  - gemfiles/twitter4_1.gemfile
+  - gemfiles/twitter4_2.gemfile
+  - gemfiles/twitter4_3.gemfile