Update OOjs UI to v0.1.0-pre (55b861b167)

New changes:
466a876 [BREAKING CHANGE] Make content isolation optional
23f26c3 [BREAKING CHANGE] Set active and pressed on the buttoned element, not the button
55b861b build: Switch from grunt-recess to grunt-contrib-less

Change-Id: Ie4454376df9492e3b77b6cc174ce7b38548cc56d