Implement ascii emoji tab completion

When a fully plaintext, ascii emoji is typed like ";-)", pressing tab will suggest emojione to replace it with based off of the meta data provided by emojione.

e.g. the aliases_ascii for `😃` are [":D",":-D","=D"] so typing ":D *tab*" will insert a real 😃

scripts/emoji-data-strip.js

@@ -5,13 +5,17 @@ const fs = require('fs');
 const output = Object.keys(EMOJI_DATA).map(
     (key) => {
         const datum = EMOJI_DATA[key];
-        return {
+        const newDatum = {
             name: datum.name,
             shortname: datum.shortname,
             category: datum.category,
             emoji_order: datum.emoji_order,
         };
-    },
+        if (datum.aliases_ascii.length > 0) {
+            newDatum.aliases_ascii = datum.aliases_ascii;
+        }
+        return newDatum;
+    }
 );
 
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