PS-68 add new branding solution for integrations

Some of the branding info was removed in https://github.com/everydayhero/developer.everydayhero.com/pull/16 but clients need to know which parameters are required to get branding for integrations.

- [x] peer review
- [x] tested (OK'd by PS team)

![everydayhero_api__oauth_integration-2](https://f.cloud.github.com/assets/486512/1303670/8dc03a26-3163-11e3-8e65-df95221cb7a2.jpg)