Fixes tsquillario/Jamstash#178.

Replaces $rootScope.SelectedAlbumSort with SelectedAlbumSort
Thanks to brb-at (https://github.com/brb-at)
Bumps up version to 4.2.1, modifies 4.2.0's changelog.
4.2.1 Fixes Albums stuck at spinning wheel

- Fixes tsquillario/Jamstash#178.
Thanks to brb-at (https://github.com/brb-at)