usersimple cursor for followers
followers affichage
users affichage filtré
refacto 
ajout / supp follower
picasso pour image preview
Merge remote-tracking branch 'origin/aude'

Conflicts:
	src/com/mediageoloc/ata/map/MapActivity.java
	src/com/mediageoloc/ata/user/UsersActivity.java
	src/com/mediageoloc/ata/user/UsersProvider.java