* Upgrade emoji deps and move to node_modules
Add support for Emoji 3.0 and switch from bower to yarn for managing emoji
dependencies.
// FREEBIE
* Delete old emoji deps
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* Don't copy emoji on windows
It is no longer necessary since the symlinked image dir is gone.
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* Update emoji test
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* Fix emoji tests; remove all overrides of emoji-js functions
FREEBIE
Use emojijs for replacing unicode with image tags for display. We were
already using it to replace colons with unicode. Additionally it has
a companion data repo that is kept up to date with images from all
the common image sets.
// FREEBIE
Lilia
Scott Nonnenberg
Sam Lanning