Major API changes to Component props, SingleValue and Value have been merged
The component is now "controlled", which means you have to pass value as a prop and always handle the onChange event. See https://facebook.github.io/react/docs/forms.html#controlled-components
Using values that aren't in the options array is still supported, but they have to be full options (previous versions would expand strings into { label: string, value: string })
Options & Value components get their label as their Children
new simpleValue prop for when you want to deal with values as strings or numbers (legacy behaviour, defaults to false). onChange no longer receives an array of expanded values as the second argument.
onOptionLabelClick -> onValueClick
Multiple values are now submitted in multiple form fields, which results in an array of values in the form data. To use the old method of submitting a single string of all values joined with the delimiter option, use the joinValues prop.
loadingPlaceholder prop
autoload changed to minimumInput and now controls the minimum input to load options
cacheAsyncResults -> cache (new external cache support) - defaults to true
new ignoreAccents prop (on by default), thanks Guilherme Guerchmann
new escapeClearsValue prop (on by default)
bug where the filter wouldn't be reset after blur
complex option values are much better supported now, won't throw duplicate key errors and will serialize to the input correctly
undefined default props are no longer declared