Merge pull request #10 from mihaip/master

Allow React.PropTypes.instanceOf with constructors that take parameters.
Bump 0.12.6
Fixed React.PropTypes.bool

According to the documentation http://facebook.github.io/react/docs/reusable-components.html
The right boolean propType is `React.PropTypes.bool`
Merge pull request #11 from tleunen/master

Fixed React.PropTypes.bool
Bump 0.12.7
Add externs for React.addons.Perf.