add the mock in the crawler for the storage mgr functionality.
Merge branch 'master' of https://github.com/LSIR/Monadikos.git

Thanks Michele :P

Conflicts:
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/actorsystem/TaskInterpreterStorage.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/actorsystem/TaskInterpreterUtilities.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/facebook/FacebookPictures.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/facebook/FacebookPosts.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/instagram/InstagramMedia.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/instagram/InstagramMediaLiked.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/twitter/TwitterFavorites.scala
	crawler/src/main/scala/ch/epfl/lsir/monadikos/crawler/twitter/TwitterTweets.scala