Fixed a bit docs
small fix
added how it works
readme points to docs
copyright for the moment
[FEATURE] TestFM model building plugin
[FEATURE] Small (yet not reliable) api to test TensorCoFi and Popularity using testfm
[FEATURE] All users to cache
[FEATURE] Big change in recommendation system. Recommendation is given directly from test.fm model
[???] Optimization with cache for binomial diversity. Still to heavy. Maybe some Gauss approximation is in order.
[FEATURE]
 - Simple diversifier cached
 - Link to get rando user(test purposes)
[FEATURE]  Cange popularity to testfm
[FIX]  Fix dynamic cache fill
[FIX]  Fix Testfm measure by api call
[TEST] Test get score against recommendation
Clean code
[FEATURE] model to ab testing. Note that using ab testing will make the logging slower
[FEATURE] Decorator and controller for abb testing
[FEATURE] Decoractor to log other events
[FIX] Simple reranker pushed owned items to top.