Getting properties from dapper

* Added [HTTParty](https://github.com/jnunemaker/httparty) gem so we can ***party hard*** and send get requests to the [Dapper](https://github.com/ATNI/dapper) API for user information.
  - Used for checking a user's visible properties and determining if they are an administrator.
* Created the `DapperClient` module which allows the `User` controller to get information from Dapper.
* Updated `is_admin?` and `visible_properties` methods in the User model to use the `DapperClient` module.
* Removed all traces of `Role` and `Support` whose functionality has been replaced by Dapper.
* ***Partied hard*** as the HTTParty gem demanded!!