Updating composer.lock.
Remove Loader.php reference from cli-script-bootstrap.php.
refs #6028 make sure there is always a value defined as the field is marked as NOT NULL
Re-enabling commented out tests (and removing old travis debugging).
Add xhprof to composer.json file & remove README.
Add xhprof option to tests:run command.
Rewrite setupProfilerXHProf to work with composer xhprof.
Get xhprof integration to work. Only setup xhprof once per php execution and correctly aggregate xhprof runs (xhprof aggregation will always normalize so we must aggregate ourselves).
Automate building of xhprof through composer install/update.