Removing laravel specific code in manager
minor aesthetic changes
Extending native Mongo classes:

* Client::selectDB() returns a MongolDB instance

* Client::getDB() is now deprecated in favor of selectDB()

* MongolDB::selectCollection() returns a MongolCollection instance

* MongolCollection::find() returns a Flatline\Mongol\MongolCursor instance

* Added setModel() to MongolCollection and MongolCursor to set the model
  to return instead of an array for a result document

* MongolCollection::findOne() and MongolCursor::current() returns the
  selected model instance