* No features have a 'configurations' setting, nor can I see any
client-side code looking for any. Was triggering phpcs because of
the 'global $$configuration;' line, which didn't start with "$wg".
* Remove unused selenium tests that were also triggering phpcs.
* Add composer.lock and vendor/ to .gitignore
Change-Id: If06a08b6a7c232ac69f9dff569ffa3e1c93ff0c5
