Enable realtime output from Rspec ResultPrinter

The ResultPrinter was using ob_start()/ob_clean() to remove the
automatic PHPUnit header. Unfortunately, this leaves output buffering
on, resulting in a delay in output of test progress until the entire
suite has finished.

Replacing ob_clean() with ob_clean_end() throws away the header and then
stops output buffering. Tests results are printed to the console as they
complete.

Enable the --verbose flag in the Guardfile