Update OOjs UI to v0.1.0-pre (531d497d3b)

New changes:
3cd90ee TextInputWidget: Allow changing 'type' attribute
8bf9c29 FormLayout: Accept HTML form attributes as config options
fadc51d OOUI PHP: Unbreak ButtonWidget
50b926c build: Introduce 'quick-build' task
8e71673 Make padding between popup and container configurable
e432f9f Fix anchor positioning on popups
16ae17a PopupWidget: Remove references to 'show' and 'hide' events
cfe286f Localisation updates from https://translatewiki.net.
272476b GridLayout: Set dimensions.visibility = '' again if we have a height and a width

Change-Id: Ia2a6125e0da7659b08252b4ea2c2ddd9f6baa88a