.travis.yml in vagrant-config_builder-0.15.1 vs .travis.yml in vagrant-config_builder-1.0.0.rc1

@@ -1,12 +1,26 @@
 ---
 language: ruby
 sudo: false
-install: bundle install --without development
-script: bundle exec rake spec
+before_install:
+  - gem install bundler --version $BUNDLER_VERSION
+install: bundle _${BUNDLER_VERSION}_ install --without development
+script: bundle _${BUNDLER_VERSION}_ exec rspec --color --format documentation
 notifications:
   email: false
-rvm:
-  - 2.0.0
+
 env:
   global:
     - NOKOGIRI_USE_SYSTEM_LIBRARIES=true
+
+matrix:
+  include:
+    - rvm: 2.0.0
+      env: TEST_VAGRANT_VERSION=v1.6.5 BUNDLER_VERSION=1.6.9
+    - rvm: 2.0.0
+      env: TEST_VAGRANT_VERSION=v1.7.4 BUNDLER_VERSION=1.10.5
+
+    - rvm: 2.2.3
+      env: TEST_VAGRANT_VERSION=v1.8.1 BUNDLER_VERSION=1.10.6
+    - rvm: 2.2.3
+      env: TEST_VAGRANT_VERSION=HEAD BUNDLER_VERSION=1.10.6
+