support for react version 0.11.0

React v0.11.0 was recently released so the specified peerDependency in rrouter v0.4.0 is failing:

http://facebook.github.io/react/blog/2014/07/17/react-v0.11.html

The only "listed" breaking change is to getDefaultProps(), but you only appear to be using that in your PathnameRouting-test.js file- and it seems like the react v0.11.0 change won't break that instance.

I've tested a local app and things seem to be working with this package.json change.

NOTE: I've also updated the version number to v0.5.0 so you'll have to republish for this change to really take effect.

React v0.11.0 was recently released so the specified peerDependency in rrouter v0.4.0 is failing:

http://facebook.github.io/react/blog/2014/07/17/react-v0.11.html

The only listed breaking change is to getDefaultProps(), but you only appear to be using that in your PathnameRouting-test.js file- and it seems like the react v0.11.0 change won't break that instance.

I've tested a local app and things seem to be working with this package.json change.

NOTE: I originally updated package.json to v0.5.0, but after your comment in the pull request, I kept it at v0.4.0