Update OOjs UI to v0.1.0-pre (8986c46d35)

New changes:
735cebc Filter calls to selectItem and highlightItem on SelectWidget
897b30f Return null in Element#getDocument
b5ede88 Add Element#isElementAttached
68df19f Disable tool groups when all its tools are disabled
1aaa507 Grunt-watch less files
e4dd7b2 build: Update devDependencies
64d6c32 Localisation updates from https://translatewiki.net.
b5c6db5 Localisation updates from https://translatewiki.net.
b9460cb apex/button: Reset border-color of disabled button when not hovered
32c4799 Localisation updates from https://translatewiki.net.
674165e Enable jscs for OOjs UI repo
d98b338 grunt: Add messageDocumentation task to ensure each 'en' message has a 'qqq'
d421dd6 demos/tools: Indentation fix

Change-Id: I47132b3bf41889b0c76e192c6c11ff9ab22896b4
Merge "Update OOjs UI to v0.1.0-pre (8986c46d35)"