ADD: main menu settings & about row
ADD: settings view and cells
UI: use checked/unchecked icons
exchange activity indicator for animated progress view
enabling background image selection in settings view controller
display cleaned up title for music detail view controller

artist setter of Album class removes unwanted characters
ADD: Settings Slider Cell

set background image opacity
handle failing connectivity

show network activity on status bar
FIX: managed object accessor added

MusicAlbum objects would fail equality test without the artist being
returned in the cleaned up version
show network activity indicator for multi part url requests
FIX: using cleaned up artist title for multi part fetches
Merge branch 'feature/Settings' into develop