update emoji-data lib, force output to not use variants

lets turn things on progressively.  this means we’ll understand when we
see variant encoding, but won’t output it by default.
vendor js-emoji from iamcal/js-emoji@1a86f2a869
use variants instead of emojifont-restricted
ghetto hack css-imgs back in to js-emoji

ghetto workaround using local modifications to vendored filed until
iamcal/js-emoji#9 is resolved.
update vendor js-emoji to 0a5922a
Merge pull request #31 from mroth/variants

Variant support