modified albums _form to show "Please Select" on the select tag
added migration to remove artist from albums
added Feature scaffold
added features validation
added features link on the menu
added FeaturesAssignment model and migration
added database relationships to albums, features, and features_assignments
modified albums_controller and _from to show and save features in checkboxes
modified to only insert feature if the feature is not yet on the the album's features
added ability to removed features in album by unchecking the checkboxes
showed album features links in album
showed all albums that have the current feature