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

[Gustavo Pichorim Boiko]

> Now the setting remains enabled and I can create a MMS group. But I have seen
> another thing, maybe not related. If I don't send any MMS in the group and go
> back to conversations list, there is no related thread to it and therefor I
> cannot re-enter in the thread.

Although this is a behavior that needs improvement, it is not a regression or even related to the changes on this branch, so we can address that separately.
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https://code.launchpad.net/~phablet-team/messaging-app/mms_settings/+merge/310582
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