Updated mediawiki/extensions
Project: mediawiki/extensions/Bootstrap  24a01418b0b48ff89d93d8ebdea186c445242a4e

Reworking the extension

* adding a singleton to manage Bootstrap
* adding a resource loader module capable of compiling several LESS files in one single context
* removing the unused fixes.less

Change-Id: Ib69e0a7764dafe7346b73e1eae630ca141819df6