Merge branch 'master' of github.com:insignia4u/wiserheroes
Merge branch 'Refactoring'
Merge branch 'master' of github.com:insignia4u/wiserheroes
[Issue #4] Favorites and unique visitors

  - Added favorites functionality:
    - relationships between user and links
    - favoriter service
    - favorites controller
    - Added favorites features in views
    - specs for favorites
  - Added unique visitors control using cookies
    - modified link model and controller
    - viewer service, cookies control
    - specs for unique views
Fixed typo
[Issue 4] Fixes

  - Fixed favorites controller create method. Added destroy method to remove favorites
  - Fixed favoriter service logic when removing elements
  - Added callbacks to link to update favorites counter
  - Added update_counter_cache method in User model to keep track of favorited_links_count
  - Specs has been modified to control these new changes
Merge pull request #12 from insignia4u/Issue#4-Favs

Issue#4 favorites and unique visits