throw error when setState's arguments are bad
better error message for mergeHelpers and setState
Don't store mount image on component instance
CSS widows property is unitless

Ref #836
More unitless CSS properties

volume, stress, pitch-range, richness
Refactor unit test
Unitless CSS flex properties
CSS column-count property is unitless
Document isMounted

Text from @petehunt
Clarify componentWillMount behavior
Merge pull request #928 from nick-thompson/componentWillMount-descrip

Clarify componentWillMount behavior
Merge pull request #822 from chenglou/setstate

better error for bad setState arguments and mergeHelpers
docs fix back link in Examples
Merge pull request #852 from spicyj/no-store-mount-image

Don't store mount image on component instance
docs add jsx->js tab to live editors
.gitattributes to ensure LF line endings when we should
Normalize line endings
Update homepage for new JSX/JS editor
Merge pull request #931 from spicyj/master

Update homepage for new JSX/JS editor
Fix ChangeEventPlugin Dependencies

When React moved to attaching top-level event listeners on-demand, not all of the dependencies for `ChangeEventPlugin` were set. This led to `onChange` events not firing under certain circumstances. For example, listening to `onChange` on a checkbox will not work because it relies on `onClick` (unless something else on the page was listening to `onClick`).