v2.4.3 hotfix roll-up release

NEW this release:

• require explicit confirmation on creation of new airnames from the playlist editor #82
• provide automatic deletion of airnames which are not in use (that is, are not referenced by at least one playlist or music review) #82
• allow DJs to edit/rename existing airnames #85

Miscellaneous enhancements:

• open select APIs for cross-origin scripting outside the organization #80
• prevent unintentional creation of empty playlists #84

Fixed:

• playlists will not accept entries with whitespace in album/label fields #75
• onNow playlist request should return most recent list for current time #79