This gets the oa_messages feature out of its overridden state.
Reverting the field instances for daily and weekly digest.
Merge branch '7.x-2.x' of github.com:phase2/oa_core into oa_messages-overridden-fix
This adds the message_notify_daily_digest and message_notify_weekly_digest field instances to the oa_messages feature.
This allows us to unset the message_notify_daily_digest and message_notify_weekly_digest field instances if the message_digest module is disabled so the oa_messages feature won't be  overridden.
Merge pull request #2 from scottalan/oa_messages-overridden-fix

[oa_messages] This gets the oa_messages feature out of its overridden state.