Support passing props to input

[Andreyco]

Either support passing props to underlying input, or allow user to provide component to render.

[hibiken]

Currently the component takes a quite few props that are directly passed to input (value, onChange, placeholder, inputName, inputId, and also nested under styles and classNames)

@Andreyco Did you have any specific prop in mind?

Also, I'm thinking about combining these props to inputProps (object) in the next version release.

[Andreyco]

onBlur event is what I am looking for.

I will play with the lib locally and will try to add support for custom input element, which will allow flexibility & no similar feature requests like this :)

[hibiken]

Closes via #60