Reorganizing project structure. Start recommendation models. New cache paradigm.
[FEATURE] Finish item, user and inventory models
[FEATURE] TensorCoFi  from db
[FEATURE] Popularity model in version 2.0
[FEATURE] First test on models(array field)
[FEATURE] Test suit for the cache manager
[FEATURE] Suit for items ready. Suit for user models half done.
[FEATURE] Finish user test suit and fix some bugs
[FEATURE] Finish tensorcofi test suite
[FEATURE] Rearange decorators
[FEATURE] Core module done
[FEATURE] Tests and fix on popularity
[FEATURE] Test suite on tensorCoFi controller
[FEATURE] Set Travis file
[FEATURE] Recommendation api
[MINOR] Add data
[FIX] Fix cache stuff on core
[FIX] Models
[FIX] Fix decorator in recommendation view in api
[FEATURE] First test on recommendation api