Add more tests, #37, #40

Re-enable emojiSize property, #39
Rename Emoji class to EmojiData, #41

- Update babel to babel 7, #35

- Add tests, #35
- Add CI setup, #36

- Do not include all.json into the bundle, #34

Send skin-color version of the emoji to handlers, #33

- High level scoped slots, #32

Add scoped slots for preview and search areas, so it can be replaced on demand
(see the demo app, example with custom templates).

- Add native emoji index, #31

- Fix preview emoji, #30

In the same PR:
- Fix emojiTooltip parameter
- Fix emoji shortnames in preview

- Fix preview title parameter #29

Updated distribution.

- Use data-title for categories and preview, #28