- Adds 4 columns to application_settings
  - 3 to mimic the configuration of existing throttles
  - 1 to store the protected paths on database
- Set default protected paths (taken from Omnibus)
- Add new section on admin panel to personalize protected paths
configuration
- Includes additional protected paths throttles.
- Throttles were renamed to 'rack_attack_gitlab_rails'.rb, otherwise the
omnibus file will overwrite this file.
- If the Omnibus throttle is enabled, this settings will not take
effect.