Use docker for acceptance tests
Fix strict_variables activation with rspec-puppet 2.2
Add beaker_spec_helper to Gemfile
Use random application order in nodeset
add utopic & vivid nodesets
Don't allow failure on Puppet 4
Add puppet-lint-file_source_rights-check gem
Don't pin beaker
Add nodeset ubuntu-12.04-x86_64-openstack
- Confine rspec pinning to ruby 1.8
- Various spec improvements