Remove link to AsyncState mixin

Fixes #421
Update docs
Fixes #436
Merge pull request #438 from roycehaynes/master

Fixes #436
Revert "Revert "Revert "[removed] "static" <Route> props"""

This reverts commit 53bc0fba1316838d911942fdc08827510724d101.
release v0.9.5
[added] React 0.12 compatibility

still have warnings, but we'll fix those soon
release v0.10.0
preserve Transition.prototype.constructor
this is twice as big as I'd like it to be ...
remove validation for 0.12 compatibility
release v0.10.1
[changed] use `Object.assign` instead of `merge`
[changed] use `Object.assign` instead of `copyProperties`
Merge pull request #444 from moretti/master

Use `react/lib/Object.assign` instead of `react/lib/merge` and `react/lib/copyProperties`
release v0.10.2