deleted the userList and itemList sets. they are already implied in the sorted mostLiked and mostDisliked
added ~20 tests on the inputs and stats/recommendations
fixed callbacks on the input and stats so that they fire in cases where there aren't many users
updated tests to use expect instead of assert on the includes
updated docs for version 0.1.0
added shortcuts for all the inputs and stats
updated sample content for demo app. now able to find/create a user and to create the login object