API Only show either groups options, or a single checkbox for signing up.
Treat deselection of all groups the same as unsubscribing.
Merge pull request #4 from tractorcow/pulls/1.0/simple-signup

API Only show either groups options, or a single checkbox for signing up...
Remove obsolete alias
Merge pull request #5 from tractorcow/pulls/1.0/fix-alias

Remove obsolete alias
Merge pull request #7 from camfindlay/1.0

forward port updates from 1.0 to master