v4.0.1

Major Updates:

Contains a fix for the grid layout, and other minor fixes and doc updates.

CSS

• #644: Remove flex: 1 0 100% from .row.
• #645: Dropdown: Add line-height setting.
• #647: Modal: Add color and background-color vars for header and footer.

JS

• #643: Modal: Check for undefined values when resetting scrollbar offsets.

Docs

• #646: Removed unused .collapsed class.
• #648: Additional accessibility notes for Alert and Modal widgets.