Introduce jquery.fn.reveal() for card reveals
Fixed init.js for documentation
DRY up the functions
Added card-reveal trigger on hover
Updated documentation to reflect the new feature
Merge card-reveal feature into master

* feature/card-reveal-jquery-fn:
  Updated documentation to reflect the new feature
  Added card-reveal trigger on hover
  DRY up the functions
  Fixed init.js for documentation
  Introduce jquery.fn.reveal() for card reveals