readme: Move license information to LICENSE.md

Closes #13

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+# Licenses
+
+* Copyright 2016 Brad Erickson CC-BY-4.0
+* Copyright 2015 Ranks.com Inc. CC-BY-4.0
+* Copyright 2015 Twitter, Inc. CC-BY-4.0
+
+## Artwork
+* Applies to SVG file and TTF font files
+* License: Creative Commons Attribution 4.0 International
+* Human Readable License: http://creativecommons.org/licenses/by/4.0/
+* Complete Legal Terms: http://creativecommons.org/licenses/by/4.0/legalcode
+
+## Source Code
+* Applies to everything else
+* License: MIT
+* Complete Legal Terms: http://opensource.org/licenses/MIT
+
+## Emoji One License
+The SVG files of the [Emoji One](http://emojione.com/) project have been
+modified to create the fallback emoji glyphs and used as-is for the SVGinOT
+color glyphs. Files are stored in `assets/emojione-svg`.
+
+* Source: https://github.com/Ranks/emojione
+* Art License: Creative Commons Attribution 4.0 International
+
+Please review the specific attribution requirements for commercial use of
+Emoji One icons: http://emojione.com/licensing/
+
+## Twitter Emoji for Everyone License
+A few SVG files of the Twitter Emoji for Everyone project are used to fill in
+where Emoji One is missing characters required to generate a font. Files are
+stored in `assets/svg`.
+
+* Source: https://github.com/twitter/twemoji
+* Art License: Creative Commons Attribution 4.0 International