v1.6.2

The Rhino release is fixed!
ability to use uppercase colours
Fix a nasty bug causing syntax errors when selector interpolation is preceded by a long comment (and some other cases)
Fix a major bug with the variable scope in guards on selectors (e.g. not mixins)
Fold in & when () { to the current selector rather than duplicating it
fix another issue with array prototypes
add a url-args option which adds a value to all urls (for cache busting)
Round numbers to 8 decimal places - thereby stopping javascript precision errors
some improvements to the default() function in more complex scenarios
improved missing '{' and '(' detection