add less-1.6.3.js, add tests for bug report #81
use Less_Parser for testing
Fixed incorrect property interpolation for certain variable types
ability to insert uppercase color names
Cache buster for url tokens
Added rounding of output numbers
Renamed cachebuster to urlargs
improved multiple `default()` guards conflict detection, updated tests
update lessjs/selector test
update expected results
fix bug with css guards
make selector-less css guard fold into the current selector
fix double toCSS calls in unusual situations causing an exception
update lessjs tests to 1.6.3