Add back the payments tab on user's page
Revert "Hide payment methods option and title on contributions#edit"

This reverts commit e827c2795747217b2826b312b605f5aed8bd4b5f.
Create :payment_authorized state for Contribution
Remove explicit state names on StateMachines

Default state values are already state names.
Fix typo on Contribution's state name
Remove extra blank line
Remove unnecessary comment
Improve indentation of code

Conflicts:
	app/models/concerns/project/state_machine_handler.rb
Rename payment engines to payment engine
Show gross amount of Contribution when User choosed to pay fees
Mount neighborly-balanced gem in /balanced
Add some styles for bankaccount confirmations new page
Remove require neighborly-balanced user from user model
Adjust style for bank account contributions#new
Create section for bank account notice when contributing

Part of neighborly/neighborly-balanced-bankaccount#15
Add spacing for checkbox inputs on payments page
Update payment engines and add bank_account_uri to balanced_contributors table
Update balanced bankaccount gem version
Remove payment_authorized state from contributions
Change time range on can_cancel function to 6 weekdays

It also remove the boleto infrastructure and change double quotes to single on
contribution specs.