Update src/Clay/Display.hs

correct visibility function to return "visibility" instead of "overflow"
Merge pull request #12 from indygemma/patch-1

Update src/Clay/Display.hs
Version bump and updated changelog.
Changed homepage to fvisser.nl/clay.
Rotate only takes one argument.
Added opacity property.
Render Clay banner by default.

Can be turned off using config.
Updated changelog.
Version bump.
Add comma between font family names and fallback types.

This is needed for Firefox.
Updated CHANGELOG.
Change project url to fvisser.nl.
Added outline related properties.
Fixed bug in monospace font-family.
Updated changelog.
Fixed value grammar of radial gradients.
Added mask related properties.
Added mask-composite property.
Allow multiple box-shadows.
Don't use special names to avoid clashes.