Add explicit license

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 Benno Evers
+
+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.

LICENSE.matplotlib

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+This library does not contain any files from the matplotlib project, nor
+does it make any changes to it. On the other hand, the code contained herein
+is perfectly useless without a separate installation of matplotlib.
+I don't know enough about US copyright law to decide whether this implies
+that this library "uses" or is "based on" matplotlib.
+In any case, matplotlib comes with the following license:
+
+License agreement for matplotlib 1.4.3
+1. This LICENSE AGREEMENT is between the Matplotlib Development Team (“MDT”),
+   and the Individual or Organization (“Licensee”) accessing and otherwise
+   using matplotlib software in source or binary form and its associated documentation.
+
+2. Subject to the terms and conditions of this License Agreement, MDT hereby grants
+   Licensee a nonexclusive, royalty-free, world-wide license to reproduce, analyze,
+   test, perform and/or display publicly, prepare derivative works, distribute, and
+   otherwise use matplotlib 1.4.3 alone or in any derivative version, provided, however,
+   that MDT’s License Agreement and MDT’s notice of copyright, i.e.,
+   “Copyright (c) 2012-2013 Matplotlib Development Team; All Rights Reserved” are retained
+   in matplotlib 1.4.3 alone or in any derivative version prepared by Licensee.
+
+3. In the event Licensee prepares a derivative work that is based on or incorporates
+   matplotlib 1.4.3 or any part thereof, and wants to make the derivative work available
+   to others as provided herein, then Licensee hereby agrees to include in any such work a
+   brief summary of the changes made to matplotlib 1.4.3.
+
+4. MDT is making matplotlib 1.4.3 available to Licensee on an “AS IS” basis. MDT MAKES NO
+   REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED. BY WAY OF EXAMPLE, BUT NOT LIMITATION,
+   MDT MAKES NO AND DISCLAIMS ANY REPRESENTATION OR WARRANTY OF MERCHANTABILITY OR FITNESS
+   FOR ANY PARTICULAR PURPOSE OR THAT THE USE OF MATPLOTLIB 1.4.3 WILL NOT INFRINGE ANY
+   THIRD PARTY RIGHTS.
+
+5. MDT SHALL NOT BE LIABLE TO LICENSEE OR ANY OTHER USERS OF MATPLOTLIB 1.4.3 FOR ANY
+   INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES OR LOSS AS A RESULT OF MODIFYING,
+   DISTRIBUTING, OR OTHERWISE USING MATPLOTLIB 1.4.3, OR ANY DERIVATIVE THEREOF,
+   EVEN IF ADVISED OF THE POSSIBILITY THEREOF.
+
+6. This License Agreement will automatically terminate upon a material breach of
+   its terms and conditions.
+
+7. Nothing in this License Agreement shall be deemed to create any relationship of
+   agency, partnership, or joint venture between MDT and Licensee. This License
+   Agreement does not grant permission to use MDT trademarks or trade name in a
+   trademark sense to endorse or promote products or services of Licensee, or any
+   third party.
+
+8. By copying, installing or otherwise using matplotlib 1.4.3, Licensee agrees to be
+   bound by the terms and conditions of this License Agreement.