Bug 895307 - [SMS] should detect phone numbers when then word before it ends with a number

* Removes '.' as a safe character - this means blah.http://blah.com/ will no longer match (okay?)
* Only advances the regexp matcher to the next "safe character" when encountering a non-safe start
Merge pull request #11112 from steveck-chung/bug-895307

Bug 895307 - [SMS] should detect phone numbers when then word before it ends with a number. r=steveck-chung