Allow composition of state modifications and callbacks.

Previous strategy of transforming everything into effects fails because
React's .setState isn't applied in the same scope.
Scalaz 7.1 to RC2
Added ability to run & lift normal StateT
Added all state methods to the ReactS.Fix[S] helper
Scalaz doco & example (minimal)
React to 0.11.1
Removing modState hack
runState now gets React state inside IO
Added ReactS.gets{,T}

Also relaxed a few Bind constraints into Functors.
Allow access to the underlying component for interop with components that expect a bare reactComponent.
Update to jsCtor per #11
Merge pull request #11 from ddispaltro/underlying_constructor_access

Expose JS constructor