Handle colored emoji modifiers (added in iOS 9.0)

[pfives]

This is sort of the same as #82 but iOS has also added support for emoji modifiers (http://emojipedia.org/modifiers/) essentially a shading color option to the emojis, e.g. various skin tones yellow, brown, black etc.

They accomplished this by adding extra bytes to the end of the emoji representation. So for example escaped unicode for the first bump is: \u1F44A while a modified one can be represented as \u1F44A\uDC4A.

I'm not sure if it's really worth it to package 6*[available emojis that can be modified] more images into the library so alternatively it should just strip out the modifiers because currently it looks like:

[sabisab]

any progress with this issue?