v0.2.0

• PR#9 Rename Paygate::FormHelper to Paygate::Rails::FormHelper. (johnnyshields)
• PR#9 Do not include Paygate::FormHelper in ActionView::Base. (johnnyshields)
• PR#9 Update BIN list. Note BINs can now be a flexible number of digits. (johnnyshields)
• PR#9 Rename data config YAML keys. (johnnyshields)
• PR#10 Add Rubocop and fix compliance issues. (johnnyshields)