should_update? passing in native objects and expecting native true false return

[catmando]

should_update? passes two native object hashes (for new params, and new state) and only works properly if true or false are returned (i.e. nil does not work as false)

This all work aroundable, but a nuisance... Luckily should_update? is not used that frequently. At least lets update the documentation

[sollycatprint]

This issue was moved to reactrb/reactrb#113