Updated mediawiki/skins
Project: mediawiki/skins/chameleon  764715a91c97614e4dcbe7af075ad2d09db03eaf

NS-Usage + MainContentTest

- Make the NS usage a bit more PSR-2 conform [0]
- Adds a simple MainContentTest

[0] http://www.php-fig.org/psr/psr-2/

Change-Id: I0a11bebaf5230a48a09fde2cea0b8eaf13288f24