Added Tweepy contributor and license information

lib/tweepy/CONTRIBUTORS.txt

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+Thank you to all who have contributed to this project!
+If you contributed and not listed below please let me know.
+
+Aaron Swartz
+Adam Miskiewicz
+AlanBell
+Arthur Debert
+Bas Westerbaan
+Chris Kelly
+Clay McClure
+Ferenc Szalai
+Gergely Imreh
+Guan Yang
+Ivo Wetzel
+James Rowe
+Jenny Loomis
+Johannes Faigle
+Kumar Appaiah
+Michael (Doc) Norton
+Pascal Jürgens
+Robin Houston
+Sam Kaufman
+Thomas Bohmbach, Jr
+Wayne Moore
+Will McCutchen
+gilles
+Can Duruk
+Jan Schaumann (@jschauma)
+Stuart Powers
+Jeff Hull (@jsh2134)
+Mike (mikeandmore)

lib/tweepy/LICENSE.txt

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+MIT License
+Copyright (c) 2009-2010 Joshua Roesslein
+
+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.