Mergin from Git for 0.0.3.3 release

git-svn-id: http://plugins.svn.wordpress.org/wp-pjax/trunk@689228 b8457f37-d9ea-0310-8a92-e5e31aec5664
README updates, Code cleanup, commented out some debug code, fix for URL parsing for finding element to add active class to
README updates, Code cleanup, commented out some debug code, fix for URL parsing for finding element to add active class to