Pin gem versions for stable branch

This intends to pin all the major gems to the version they were during
development cycle.  This should isolate the existing tests from changes in
rspec, etc.

Change-Id: If7e1b8a7a0f170fe901646f77e9f2f07d0f8ae5b

Gemfile

@@ -1,9 +1,13 @@
 source 'https://rubygems.org'
 
 group :development, :test do
-  gem 'puppetlabs_spec_helper', :require => false
+  gem 'puppetlabs_spec_helper', '~> 0.4.1', :require => false
+  gem 'rspec', '~> 2.14.0'
+  gem 'mocha', '~> 0.10.5'
+  gem 'rspec-puppet', '~> 1.0.1'
   gem 'puppet-lint', '~> 0.3.2'
   gem 'rake', '10.1.1'
+  gem 'webmock', '~> 1.18.0'
 end
 
 if puppetversion = ENV['PUPPET_GEM_VERSION']