Partying hard with HTTParty!!

Added the HTTParty gem to send Group lookup requests to Dapper.
Added DapperClient module

This module talks to the Dapper API to look up information about a user.
Currently it can look up whether or not a user is an administator, and
which properties they have access to.
Removed Role and Support

* Removed models and controllers for Role and Support
* Removed references to role from User model
* Created migration to drop Role and Support tables, as well
  as the role mask in the User table.
Integrated DapperClient

* is_admin? and visible_properties now use the DapperClient to get the
  user's information based on their username, which represents their
  SamAccountName
* Updated seeds.rb to match the properties in Dapper
* Fixed bug in the user lookup in the DapperClient
Deleted remaining references to Roles
Merge pull request #2 from ATNI/getting-properties-from-dapper

Getting properties from dapper