added getTrack method to MongoTrackDao (test needs refactoring)
extracted setup and teardown of mongo into MongoFixture
renamed variable to something more meaningful
renamed test class to reflect class being tested
added MongoUserDao
intellij cleaning up suggestions
MongoTrackDao now takes in collections rather than host and db name
MongoUserDao now takes in collections rather than host and db name
removed unecessary throws statement
removed blank lines
refactor: simplified implements statement