Release 3.28.0 rc1

### Fixed Bugs:
- Mac installation instructions
- Remove duplicate ExternalAccounts controller actions
- Remove duplicate RippleAddresses controller actions
- Remove duplicate Users controller actions
- Remove unused files in lib/core and test/core

### Added Features:
- Extract capistrano into https://github.com/gatewayd/gatewayd-capistrano
- Extract docker into https://github.com/gatewayd/gatewayd-docker
- Add Procfile for process management on Heroku and / or with Foreman
- Support currency amount in CLI
- Bridges database table migration and ORM Model
- Add controller actions for gateway_transactions database table
- Refactor CRUD routes for all resources to be DRY
If anyone would like to attempt DRY up the controller response handling that would be fantastic, we are currently focused on stability with respect to core interaction with the Ripple-REST API