fix issue with unquoted urls in mixins having their context evaluated
fixed merging of interleaved properties
clamped rgba format color output
 `default` function: added error when used with css-guards
data-uri function used single quote, switched to "
fixed using starting index for parser nodes for accurate source maps
support shadow dom selectors
fix css guard error. less.js 1796
this->env is an object not array
Less_Tree_DefaultFunc used statically
make sure defaultused is set
add 1.6 tests
cache Selector css for performance improvement
cache oelements for better performance improvement
move firstSelector output back to Selector
remove firstcombinator property
element combinator as string
remove tree_combinator
remove old code
use selector->elements_len, small compiler optimizations