Message API key failures.
Exit elegantly when no mandrill object loads in get_inbound_domains.
Set coherent defaults for email parts on groups_settings_form.
Initialize an email sender key in mailsystem for the groups modules.
Merge branch '7.x-2.x-mandrill-groups' of github.com:thinkshout/mandrill into 7.x-2.x-mandrill-groups
Merging conflicts.