Collapsing toolbar scroll problem when keyboard pops up

[halilb]

Hi, thanks for the awesome library!

I'm experiencing a problem with collapsing toolbar. Content stops scrolling when keyboard is displayed and hidden. Here is a video that demonstrates the problem: https://drive.google.com/file/d/0B6CLZ40sQhczNGVtaGxsZDJiT01VTi1DcEl6cjE4dFNsQUlB/view

You can also checkout this commit to see my demo code: halilb@a7e5bdf

Thanks again!