Convert image file names from unicode to Slack short hand.

Instructions

Put all the images you want to map inside the sourceImages folder.
- This assumes they're PNG files.
Run node emoji.js
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Resources

I used the images found on iamcal's emoji-data. This is also where the emoji_pretty.json file exists.
This was used for my Mister Moji - An LED Panel for your Slack emoji reactions, but figured it might be useful to someone else.

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