Change categories according to EmojiOne

[jonathanwiesel]

All / most definitions have been recategorised following the original EmojiOne definition fie.

Category distribution has changed from this:

{
  "activity": 62,
  "celebration": 4,
  "emoticons": 189,
  "flags": 257,
  "foods": 7,
  "modifier": 5,
  "nature": 138,
  "objects": 247,
  "objects_symbols": 119,
  "other": 204,
  "people": 332,
  "places": 91,
  "travel": 7,
  "travel_places": 31,
  "symbols": 28
}

to this:

{
  "activity": 102,
  "flags": 257,
  "food": 67,
  "modifier": 5,
  "nature": 148,
  "objects": 178,
  "objects_symbols": 75,
  "people": 496,
  "travel": 115,
  "travel_places": 7,
  "symbols": 271 
}

This introduces the following breaking changes:

• The following categories disappear:

places
emoticons
other
celebration

• The foods category has been renamed to food.

This resolves #11

[connorshea]

👏