Positions single property support (like "relative: top -100px")

[lastw]

Inspected generated .css file and surprised of ((null)) property:

.cards{position:relative;top:-100px;((null)):0;height:240px;}

I thought single parameters are supported. Fixed, updated tests.

[notslang]

+1

[lastw]

ping

[webdif]

This request should be closed, as #221 resolved it in a magnificent way.