Add gradient orientation support

[davidvb]

UPDATE: on my mac at work it didn't pickup on direction, but at home it does work and everything is on the same versions...

*A gradient that goes from left to right is not detected as such and the css code defaults it to top down.

Please translate gradient direction to css gradient orientation, or if that is impossible, allow the user to enable an gradient-orientation setting in the UI or Options. A drop down in the UI like colorzilla.com uses would be great!)*

[marekhrabe]

Hi, can you please update your CSS Hat and let me know if the problem still persists. I think we fixed the detection, so it should be correct now