Markdown library updated to 1.6.0, merge req !90

Thanks postblue

extlib/Michelf/MarkdownInterface.php

@@ -3,12 +3,12 @@
 # Markdown  -  A text-to-HTML conversion tool for web writers
 #
 # PHP Markdown
-# Copyright (c) 2004-2014 Michel Fortin
+# Copyright (c) 2004-2015 Michel Fortin
-# <http://michelf.com/projects/php-markdown/>
+# <https://michelf.ca/projects/php-markdown/>
 #
 # Original Markdown
 # Copyright (c) 2004-2006 John Gruber
-# <http://daringfireball.net/projects/markdown/>
+# <https://daringfireball.net/projects/markdown/>
 #
 namespace Michelf;
 

extlib/PHP_Markdown_License.text

@@ -1,36 +0,0 @@
-PHP Markdown
-Copyright (c) 2004-2008 Michel Fortin  
-<http://www.michelf.com/>  
-All rights reserved.
-
-Based on Markdown  
-Copyright (c) 2003-2006 John Gruber   
-<http://daringfireball.net/>   
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-* Redistributions of source code must retain the above copyright notice,
-  this list of conditions and the following disclaimer.
-
-* Redistributions in binary form must reproduce the above copyright
-  notice, this list of conditions and the following disclaimer in the
-  documentation and/or other materials provided with the distribution.
-
-* Neither the name "Markdown" nor the names of its contributors may
-  be used to endorse or promote products derived from this software
-  without specific prior written permission.
-
-This software is provided by the copyright holders and contributors "as
-is" and any express or implied warranties, including, but not limited
-to, the implied warranties of merchantability and fitness for a
-particular purpose are disclaimed. In no event shall the copyright owner
-or contributors be liable for any direct, indirect, incidental, special,
-exemplary, or consequential damages (including, but not limited to,
-procurement of substitute goods or services; loss of use, data, or
-profits; or business interruption) however caused and on any theory of
-liability, whether in contract, strict liability, or tort (including
-negligence or otherwise) arising in any way out of the use of this
-software, even if advised of the possibility of such damage.