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

[Renato Araujo Oliveira Filho]

Review: Needs Information

Do we expect that "enter" key send a message too? or only the "return" key? 
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https://code.launchpad.net/~phablet-team/messaging-app/enable_return_to_send/+merge/314178
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