[Merge] lp:~phablet-team/telephony-service/split-multipart-messages into lp:telephony-service

[Gustavo Pichorim Boiko]

Review: Needs Fixing

Code looks good, but can you just add a comment saying that in some protocolos sending multiple attachments don't work, and that's why we have to split the message?
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https://code.launchpad.net/~phablet-team/telephony-service/split-multipart-messages/+merge/297187
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