* Modified FOIL_container

* Added unit tests for FOIL_container functions

* Added knowledge_current_best notebook

* Added knowledge_FOIL notebook

* Added knowledge_version_space notebook

* Added images for knowledge_FOIL notebook

* knowledge.ipynb replaced by knowledge_current_best.ipynb, knowledge_version_space.ipynb, knowledge_FOIL.ipynb

* modify knowledge.py

* corrected cell type

* fixed umbrella_prior not defined error

* minor changes

* added min_consistent_det to knowledge.ipynb

* some minor changes

* Update knowledge.ipynb

* Update notebook.py

* Update knowledge.ipynb

* bringing it all together in notebook

* Update knowledge.ipynb

* Update test_knowledge.py

* fix small bug in knowledge.py

If hypotheses was empty, it would fail.

* add knowledge.ipynb

* fix dollar signs

* add image