Fixed gate by Updating Gemfile to pin Rake to 10.1.1

The latest Rake update requires Ruby >= 1.9. Bundler in the
current gate uses 1.8.x. This update fixes the gate by pinning
Rake to the last known working version.

Change-Id: I841864dc1c84249f2989d81a7f5fd909a3dab6b6

Gemfile

@@ -3,6 +3,7 @@ source 'https://rubygems.org'
 group :development, :test do
   gem 'puppetlabs_spec_helper', :require => false
   gem 'puppet-lint', '~> 0.3.2'
+  gem 'rake', '~> 10.1.1'
 end
 
 if puppetversion = ENV['PUPPET_GEM_VERSION']