Update to new Org URLs

Author: nschonni

CONTRIBUTING.md

@@ -1,5 +1,5 @@
 # Contributor guidelines - CSSLint
 
-* Check out the [Contributing wiki](https://github.com/stubbornella/csslint/wiki/Contributing) and [Developer Guidelines](https://github.com/stubbornella/csslint/wiki/Developer-Guide) first
+* Check out the [Contributing wiki](https://github.com/CSSLint/csslint/wiki/Contributing) and [Developer Guidelines](https://github.com/CSSLint/csslint/wiki/Developer-Guide) first
 
-* To add properties that CSSLint recognizes, submit a patch to [nzakas/parser-lib](https://github.com/nzakas/parser-lib)
+* To add properties that CSSLint recognizes, submit a patch to [CSSLint/parser-lib](https://github.com/CSSLint/parser-lib)