Commented Feature: Implement Get Muted User Ids [2215]

Get the list of users ids who have been muted by the current user : [https://dev.twitter.com/docs/api/1.1/get/mutes/users/ids](https://dev.twitter.com/docs/api/1.1/get/mutes/users/ids)
Comments: Associated with changeset 42700: Version 0.9.7.0
- Move Get Muted User Ids into the Account Controller