.travis.yml in less-rails-2.3.2 vs .travis.yml in less-rails-2.3.3

@@ -6,9 +6,12 @@
   - jruby-19mode
 gemfile:
   - gemfiles/rails31.gemfile
   - gemfiles/rails32.gemfile
   - gemfiles/rails40.gemfile
+before_install:
+  - gem install bundler
+  - bundle --version
 matrix:
   exclude:
     - rvm: 1.8.7
       gemfile: gemfiles/rails40.gemfile
     - rvm: jruby-18mode