Commented Feature: Update : [statuses/mentions_timeline] Add parameters [1687]

Reference : https://dev.twitter.com/docs/api/1.1/get/statuses/mentions_timeline

Update methods :

- User.GetMentions()

Parameters to add :

- count
- since_id
- max_id
- trim_user
- contributor_details
- include_entities
Comments: Associated with changeset 36456: Version 0.9.3.0
- Huge update

- Added all the parameters to the HomeTimeline
- Added all the parameters to the UserTimeline
- Added all the parameters to the MentionsTimeline

- Cleanup the code logic for Search so that is now simple to test
- IUser now exposes a UserIdentifier to simplify the accessibility to developers