added stripping types for flowtype

Hi,

Thank you very much for this great gulp plugin. It is very useful to me.

Beside React I am just starting to use flowtype checker (http://flowtype.org/)

To be able to make gulp jsxcs work with /* @flow */ files with type annotations, I added the option {stripTypes: true} to the react.transform.

I don't see any impact on the rest of the features.

Do you think it can be useful to you and/or others ?

Thank you
Best 
Nico