Update first-mate

[50Wliu]

first-mate is now more in line with the original TextMate implementation.

• Do not attempt to match newline characters asciidoctor/atom-language-asciidoc#185
• Do not attempt to match newlines nwhetsell/language-csound#3
• Do not attempt to match newline characters brownian-motion/language-frege#1
• Do not attempt to match newline characters aegypius/language-gentoo#5
• Do not attempt to match newline characters atom-haskell/language-haskell#110
• Match knowing that a newline character may not exist burodepeper/language-markdown#193
• Do not attempt to match newline characters tggreene/language-pixie#1
• https://github.com/hellerve/language-zepto/pull/1

[50Wliu]

Status: Blocked on seeing how many community language packages are affected by these changes.

[50Wliu]

Thanks to @Ingramz who kindly ran specs on all the language packages we identified a list of 8 grammar packages that need updating.

[Ingramz]

I think we can pull the trigger on this one. We could wait for feedback from the still-open pull requests, but even if there are any bugs, there should be plenty of time to react to that.

[50Wliu]

For the three remaining open PRs, all have comments that effectively say "changes looks good, and I'll probably merge after checking locally". I agree that this PR can be merged now.

[maxbrunsfeld]

Thanks for finishing this up @Ingramz, @50Wliu!