update logo license (#373)

* update logo license
  - fix #62
  - noted MDAnalysis trademark
  - noted copyright on included logos belongs to NumFOCUS
* use ® following NF guidelines "Guide for Projects with a Registered Trademark"

Author: orbeckst

LICENSE

@@ -452,23 +452,12 @@ SOFTWARE.
 
 =======================================================================
 
-MDAnalysis logo
-
-The MDAnalysis 'Atom' logo was created by Christian Beckstein and is
-
-Copyright (c) 2011 Christian Beckstein
-
-MDAnalysis Logo 'Atom' by Christian Beckstein is licensed under a
-Creative Commons Attribution-NoDerivs 3.0 Unported License.
-To view a copy of this license, visit
-http://creativecommons.org/licenses/by-nd/3.0/ or send a letter to Creative
-Commons, 444 Castro Street, Suite 900, Mountain View, California, 94041, USA.
-
-The logo, and derivatives as detailed in the MDAnalysis/mdanalysis github
-repository, can be found in some of the individual sessions/lectures under the
-'imgs' directories. These are named "mdalogo.png" and "MDA-Background.png".
-Derivatives of the logo are also embedded in "Day3-Session1-Lecture/MDAParallelization.pdf"
-and "Day3-Closing-Lecture/MDAnalysis_Workshop_final_no_logo.pdf".
+MDAnalysis and MDAKit logo
 
+MDAnalysis® is a registered trademark of NumFOCUS, Inc. The MDAnalysis 'Atom'
+logo and the 'MDAKits Registry' logo are copyrighted by NumFOCUS, Inc. These
+two logos may not be used outside the MDAnalysis organization unless explicit
+written permission has been granted by NumFOCUS, Inc.
 
 =======================================================================
+