Add support to create Gradients and Shadows

[COD3BREAK3R]

Hello, thanks for this extension that makes life easier for web programmers.

I like it if you could add an option to create gradients, with stops, angles, create gradients radially and linearly, etc; this would make it the perfect extension for CSS.

And if it is not too much to ask for a shadow creator with a box model. With all this, it would be the perfect extension.

Thanks for this great extension :)