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: I13b82b73e805fb87ee95743130f1485abf3fc734

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']