Add support for the unicode variation selector (fe0f) added to 107 emojis in iOS 7 / OS X 10.9.

http://www.unicode.org/L2/L2011/11438-emoji-var.pdf
http://unicode.org/reports/tr28/tr28-3.html#13_7_variation_selectors
Add missing train emoji
Fix up incorrect/mising speaker emojis
Make mappings private pending better names