Update OOjs UI to v0.1.0-pre (d6008381aa)

New changes:
8c60d3c Create a combo box widget
944c47c Update oojs to v1.0.12
23f26c3 [BREAKING CHANGE] Set active and pressed on the buttoned element, not the button
55b861b build: Switch from grunt-recess to grunt-contrib-less
7205b2a build: Check for files' existence before building using grunt-file-exists
d600838 Make window managers destroyable

Change-Id: I6af60421093b5ec4604fe9a7f79bf18b5a5ecbf9