Fixed a bug in the Album Create view.

Fixed a bug that caused Artist and Tag fields to be required.
Fixed a bug in the Album Create view.

Fixed a bug that caused only where users without the permission to
create Tags could create Tags.
Added a different Bootstrap CSS for Select2.

The new CSS makes Select2 fit better when used in conjunction with
Bootstrap.
Added tests for the Album Create view.

Added tests to ensure that users that did not have permission to create
new Tags or Artist Tags could not create or select tags that were not in
the database.