Change private methods and variables to protected
Merge pull request #34 from jrschumacher/feat-allow-extending-model

Change private methods and variables to protected
Fix issue when saving new record with '_id'
change filename of baseTest.php
Change visibility of 'exist' to protected
Add ability to get the model's  and MongoCollection
Fix class name
Add tests
throw error if  is not a MongoDB
Merge pull request #37 from jrschumacher/feat-get-connection-collection

Add ability to get model's connection as well as MongoCollection