the bstat redirect now does not require a wp user id after the /b rewrite base

see https://github.com/GigaOM/legacy-pro/issues/3353
removed reference to gigaom-specific functions
Merge pull request #14 from wluo/no_wpid_redirect

the bstat redirect does not require a wp id any more
Merge branch 'master' of github.com:misterbisson/bstat into abtests