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
"checkbox" not "checked"

I can only assume this was a typo.
Remove unnecessary 'NA'-fallback for getTextContentAccessor()
Update docs to mention that you need both es5-shim.js and es5-sham.js to use React with IE8.
Fix typo in docs.
Wrap _performComponentUpdate call in try/finally

Fixes #208. If you attempt a state update with a bad state then the render will fail (and the DOM won't change) but if you switch back to a valid state later then it'll rerender properly.
Rewrite Older Browsers polyfill section for clarity.
Fix lines longer than 80 chars
Merge pull request #892 from rtfeldman/update-shim-docs

Mention need for `es5-sham.js` in docs
Merge pull request #897 from spicyj/gh-208

Wrap _performComponentUpdate call in try/finally
Merge pull request #881 from spicyj/checkbox-not-checked

"checkbox" not "checked"
Remove stray "117", combine lines in polyfill docs
[docs] Add timezone to _config

This way we hopefully won't churn the feed when genereated in
a different time zone (eg France).