.travis.yml in mixed_gauge-0.1.2 vs .travis.yml in mixed_gauge-0.1.3

@@ -1,5 +1,24 @@
 language: ruby
+sudo: false
+branches:
+  only:
+    - master
 rvm:
-  - '2.0'
-  - '2.1'
-  - '2.2'
+  - 2.0
+  - 2.1
+  - 2.2
+gemfile:
+  - gemfiles/ar_4.1.0.gemfile
+  - gemfiles/ar_4.1.7.gemfile
+  - gemfiles/ar_4.1.8.gemfile
+  - gemfiles/ar_4.2.gemfile
+  - gemfiles/rails_edge.gemfile
+matrix:
+  allow_failures:
+    - gemfile: gemfiles/rails_edge.gemfile
+  exclude:
+    # Rails 5 requires to run on Ruby 2.2.0 or newer.
+    - rvm: 2.0
+      gemfile: gemfiles/rails_edge.gemfile
+    - rvm: 2.1
+      gemfile: gemfiles/rails_edge.gemfile