Update references to new project location

* Change 'github/gollum' references to 'gollum/gollum'

lib/gollum/frontend/public/gollum/livepreview/licenses/licenses.txt

@@ -23,7 +23,7 @@ http://creativecommons.org/licenses/by-sa/3.0/legalcode.txt
 ---
 
 Gollum (MIT License)
-https://github.com/github/gollum/blob/master/LICENSE
+https://github.com/gollum/gollum/blob/master/LICENSE
 
 ---
 

lib/gollum/frontend/public/gollum/livepreview/readme.md

@@ -4,7 +4,7 @@
 Uses code/assets from:
 
 0. [ace](https://github.com/ajaxorg/ace)
-0. [gollum](https://github.com/github/gollum)
+0. [gollum](https://github.com/gollum/gollum)
 0. [jquery](https://github.com/jquery/jquery)
 0. [sizzle](https://github.com/jquery/sizzle)
 0. [notepages](https://github.com/fivesixty/notepages)

lib/gollum/markup.rb

@@ -460,7 +460,7 @@ module Gollum
     #           Acceptable formats:
     #              ```language:local-file.ext```
     #              ```language:/abs/other-file.ext```
-    #              ```language:github/gollum/master/somefile.txt```
+    #              ```language:gollum/gollum/master/somefile.txt```
     #
     #########################################################################