Bug 900413: [Messages] Should detect and link 5 digit short codes in message text. - r=gnarf

- Updated minimum digits to be detected as a phone number to 5
- Ensured that when 5 digits, the number is only 5 characters without removing separators

Closes gh-12490
Bug 921297 - Really enable travis irc notifications r=me
Bug 919962 - [MMS] Converting to text layout when sending a MMS r=gnarf

We now display the banner in an asynchronous way therefore the previous way to
hide the banner synchronously didn't work.

This patch changes the logic then: instead of hiding the banner after displaying
it, it now prevents the banner from being displayed at all.
Bug 913994 - [Messages] When sending SMS to a number included in a SMS, we should load the thread after clicking on send r=gnarf

The problem was simple: we were not resetting inThread when handling the #new
hash.
Merge remote-tracking branch 'origin/master'