Add testing on Ruby 1.8.7 with Puppet 3 to travis.yml

Author: Colleen Murphy

.travis.yml

@@ -5,6 +5,8 @@ script: "bundle exec rake validate && bundle exec rake lint && bundle exec rake
 matrix:
   fast_finish: true
   include:
+  - rvm: 1.8.7
+    env: PUPPET_GEM_VERSION="~> 3.0"
   - rvm: 1.9.3
     env: PUPPET_GEM_VERSION="~> 3.0"
   - rvm: 2.0.0