Sort out license problems

IANAL, but I think I am allowed to add missing copyright notices for
someone else. And I did my best job using git history to figure out who
wrote which functions. So I hope everything is fine.

CONTRIBUTORS

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+Sorted in alphabeticall order
+
+Adam Jackson <[email protected]>
+Brottweiler <[email protected]>
+Carl Worth <[email protected]>
+Christopher Jeffrey <[email protected]>
+Corax26 <[email protected]>
+Dana Jansens <[email protected]>
+Dave Airlie <[email protected]>
+dolio
+Duncan <[email protected]>
+Einar Lielmanis <[email protected]>
+Eric Anholt <[email protected]>
+hasufell <[email protected]>
+James Cloos <[email protected]>
+Jamey Sharp <[email protected]>
+Jarrad <[email protected]>
+Javeed Shaikh <[email protected]>
+Keith Packard <[email protected]>
+Kevin Kelley <[email protected]>
+mæp <[email protected]>
+Mark Tiefenbruck <[email protected]>
+Matthew Allum <[email protected]>
+Michael Reed <[email protected]>
+Nate Hart <[email protected]> <[email protected]>
+notfoss <[email protected]>
+Peter Mattern <[email protected]>
+Phil Blundell <[email protected]>
+Que Quotion <[email protected]>
+quequotion <[email protected]>
+Richard Grenville <[email protected]>
+Scott Leggett <[email protected]>
+The Gitter Badger <[email protected]>
+Tilman Sauerbeck <[email protected]>
+Tim van Dalen <[email protected]>
+Uli Schlachter <[email protected]>
+XeCycle <[email protected]>
+Yuxuan Shui <[email protected]>

LICENSES/MIT

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+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.