As per T467, the RfC for extension management with composer has been
declined. Hence, we can get rid of Vector.php from composer.json, thus
also solving the issue of `composer test` die()ing because it loads
Vector.php and wfLoadSkin is not found.
Any users who are currently installing the skin via composer will need
to add "wfLoadSkin( 'Vector' )" to their LocalSettings.php.
Bug: T103800
Change-Id: Icd8acc34f52be9c3c0f564744d2eb2aae7f34398
Also fixed files to match coding standards. (Checked against
tools/codesniffer v0.2.0)
Bug: T90943
Change-Id: I38dcb7a5389cf6986dc1247b9291bfb1ad3fca7d