Exposed IProps as ModalizeProps

[archansel]

Is your feature request related to a problem? Please describe.
As ts user, sometimes I need to extends Modalize props with my own props, just like many other libs, they also export its props

Describe the solution you'd like
Export IProps like you export IHandles maybe something like export type ModalizeProps = IProps, it should be a simple fix, I would make PR if you agree

[jeremybarbet]

Cf: #234