Fixed #69 : Fixed support for the NA Amazon version
Added friends' leaders history
Renamed ChooseSyncModelContainer to ChooseModelContainer to reuse it outside of the sync process
Implementing Filter Friends : added the 1st activity to choose useful leaders
Refactored friend list for friends filtering
Implementing Filter Friends : added the 2nd activity to list the useless friends
Bumped version to 2.1.0