lint: Unpin puppet-lint

puppet-lint 1.0.x has some nice features, including auto-fix, and other
things.
(gemfile) Unpin rspec version (upgrade to 3)
Convert specs to RSpec 2.99.2 syntax with Transpec

This conversion is done by Transpec 2.3.7
(lint) Fix a strange lint issue (indentation of => is not properly aligned)
Merge pull request #644 from enovance/qa-rspec

QA Rspec and puppet-lint