js-emoji fixes for OSX 10.10 Yosemite

Looks like the release of MacOSX 10.10 this weekend broke part of
js-emoji, which I vendored.  I submitted a patch to fix js-emoji at
https://github.com/iamcal/js-emoji/pull/19, but in the meantime, I
manually fixed it here as well, and made a tiny cosmetic tweak to
shrink them slightly so the emoji don’t look quite so big and attention
grabbing compared to everyone else’s titles.
Merge pull request #105 from mroth/jsemoji-fix

js-emoji fixes for OSX 10.10 Yosemite (lolz)