Improve client code and add credit card destroy method
Add public key and private key configurations
Index view
Basic crud for the credit cards manager
Add exceptions when a request is not success
Show flash message if tokenization fails
Merge pull request #2 from supherman/credit-card-manager

Credit card manager
Return the added card in the add method
Merge branch 'credit-card-manager'

* credit-card-manager:
  Return the added card in the add method
Return self after build a card
Merge branch 'credit-card-manager'

* credit-card-manager:
  Return self after build a card
Bugfix error in conekta.js
Merge branch 'credit-card-manager'

* credit-card-manager:
  Bugfix error in conekta.js
Chain javascript function
Merge remote-tracking branch 'upstream/master'

* upstream/master:
  Chain javascript function
  Bugfix error in conekta.js
  Return self after build a card
  Return the added card in the add method
  Show flash message if tokenization fails
  Add exceptions when a request is not success
  Basic crud for the credit cards manager
  Index view
  Add public key and private key configurations
  Improve client code and add credit card destroy method