Remove Balanced dependencies
Install catarse_paypal_express gem
Remove Balanced js
Add catarse_paypal_express stylesheet
Use master branch of catarse_paypal_express gem
Add micropasts-crowdfunding subdomain in blacklist of channels

Yes, it sucks, but needs some refactoying to make it work fetching list
of Channels' permalinks from DB.
Update catarse_paypal_express gem
Require :resource_id key for saving payment notifications

Since we already have more than one type of payable resources
(contributions and matches), using the :resource_id makes the interface
more generic.
Remove payment tab configuration when not required
Pull in changes from production