Bug 892480 - [SMS] Sending two phone numbers separed by space or enter should detect two phone numbers - r=arcturus

* Shorten the greediness of the match to not accept as many numbers
* Added a check to ensure that the character after the match is not a digit
* Only allow space and tab as separators in phone numbers
(cherry picked from commit 70de7c7971bbb2bdc4bd9e7ddc3f0ae3a40a9f9f)
Bug 891908 - [MMS] Replacing an attachment with a large image should trigger resizing - r=schung

* Ensure that image resizing is triggered whenever an image is added (even via replace)
(cherry picked from commit 50cbc05a8b56b39aad00b677a6c3bd5a2e900b1f)