Add travis.ci for testing multiple puppet versions.

The existing spec tests should be tested on multiple puppet version. The
addition of travis.ci allows us to easily verify all specs are passing
and new manifests did not break backwards compatibility by introducing
new syntax.

.travis.yml

@@ -0,0 +1,22 @@
+language: ruby
+rvm:
+  - 1.8.7
+  - 1.9.2
+  - ree
+before_script:
+  - "[ '2.6.12' = $PUPPET_VERSION ] && git clone git://github.com/puppetlabs/puppetlabs-create_resources.git spec/fixtures/modules/create_resources"
+after_script:
+script: "rake spec"
+branches:
+  only:
+    - tb/travis
+env:
+  - PUPPET_VERSION=2.6.12
+  - PUPPET_VERSION=2.7.6
+  - PUPPET_VERSION=2.7.9
+matrix:
+  exclude:
+    - rvm: 1.9.2
+      env: PUPPET_VERSION=2.6.12
+notifications:
+  email: false

Gemfile

@@ -0,0 +1,13 @@
+source :rubygems
+
+puppetversion = ENV.key?('PUPPET_VERSION') ? "= #{ENV['PUPPET_VERSION']}" : ['>= 2.7']
+
+gem 'puppet', puppetversion
+gem 'hiera', '>= 0.3.0'
+gem 'hiera-puppet', '>= 0.3.0'
+
+group :test do
+  gem 'rake', '>= 0.9.0'
+  gem 'rspec', '>= 2.8.0'
+  gem 'rspec-puppet', '>= 0.1.1'
+end