Carriage returns break `EmailParser#regex_split_points`

[sdhull]

So the sweet built-in ability to strip out the quoted reply text (without even doing "reply above this line") is broken if the text has \r character.

I recommend gsubbing them out (that's what I'm doing personally).

For reference, here's a string I encountered while testing:

"Weird. I thought it would trim the reply portion better.\r\n\r\n-S\r\n\r\nOn Thu, Oct 27, 2016 at 1:12 AM, Steve H <\r\nconnect+f32e22fd-e822-4e18-970c-8d0e23863dd1@staging-mg.makeminecount.org>\r\nwrote:\r\n\r\n> *The following message was sent to you from Steve H on MakeMineCount.org*\r\n> Test test test. Maybe 2nd time's the charm? -S"

Paste that into irb and you'll see it doesn't match /^On.*<\r?\n?.*>.*\r?\n?wrote:\r?\n?$/ (though it ought to). Do txt.gsub("\r", "") and you'll see that it does match.