Browser tests working through sauce

All sauce browser tests have passed at one time, though there are intermittent failures

Specs updated and passing, non sauce feature run passing.

Single place to specify use of backdrop stub controller. Single method (backdrop stub controller) to stub backdrop requests and server fixtures.

bowl limelight not currently working unless you specify a unicorn config file with more than one worker, this should probably be fixed in the development repository though - when I work out where the default unicorn config file is coming from.