[Merge] lp:~phablet-team/messaging-app/mms_settings into lp:messaging-app/staging

[Gustavo Pichorim Boiko]

> I cannot maintain the "Enable MMS messages" setting enabled. Once i leave
> Settings page it gets disabled. When reentering in settings i see it disabled
> and it is indeed that way since i cannot create a MMS group

Forgot to mention that you need the telephony-service and the account service schema packages for that to work, will update the description.
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https://code.launchpad.net/~phablet-team/messaging-app/mms_settings/+merge/310582
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