Resolve "Add missing props validators"

Closes #97 (closed)

I believe that this issue is too big and not that important to spend more time on it. Adding remaining prop types will require getting to know each component in depth. That's why I think we can leave the missing prop type as a warning and fix it on the go while e.g. making changes to on of the components that has a problem with it.

I changed some files because propTypes property was inconsistently spelled among the whole project ;P