Update README.md

Merge pull request #25 from sampepose/master

Handle case on mac where product/vendor ID not defined

Merge pull request #25 from sampepose/master

Handle case on mac where product/vendor ID not defined

Merge branch 'property_update' of https://github.com/openpnp/openpnp-…

…capture into property_update

Fixed OpenGL library issue in QtCaptureTest on Linux

property bugfixes for windows