Readme and header improvements

git-svn-id: https://plugins.svn.wordpress.org/wp-bcrypt/trunk@927198 b8457f37-d9ea-0310-8a92-e5e31aec5664
Stable version bump

git-svn-id: https://plugins.svn.wordpress.org/wp-bcrypt/trunk@927199 b8457f37-d9ea-0310-8a92-e5e31aec5664