RSpec upgrade to 3

Upgraded to RSpec 3

In the process some other gems had to be upgraded also.
All the tests pass as expected.

@stephenrichards @axemonkey when you get a minute, please give it once over.

@jasiek if you've got a spare minute, it'd be cool if you could look at this also.

Thank you :japanese_goblin: :guitar: :fallen_leaf: 
Not in scope of this PR, but does this add a `heartbeat` action to every controller?