.travis.yml in simple-navigation-3.14.0 vs .travis.yml in simple-navigation-4.0.0

@@ -1,4 +1,12 @@
+before_install:
+  - gem install bundler
+
 rvm:
-  - 1.9.3
   - 2.0.0
-  - 2.1.1
+  - 2.1.5
+  - 2.2.1
+
+gemfile:
+  - gemfiles/rails-4-2-stable.gemfile
+  - gemfiles/rails-4-1-stable.gemfile
+  - gemfiles/rails-3-2-stable.gemfile