add 1.5.1, add to-css-visitor, fix isReplacing
more readable errors
display fatal errors
make sure $rule is an object
keep php from converting objects to arrays by using array_unshift() instead of array_splice()
add paths to contexts after joinSelectors()
correct indentation
correct matchCondition frame
Less_Tree extend for Less_Tree_Expression
always push onto contexts
git reset --soft "HEAD^"
newline characters
check for extendOnEveryPath
createDerived() argument defaults
default value of $env in toCSS()
fix creation of Less_Tree_Ruleset objects
check for originalRuleset property
extendList should always be an array
set $when and $extend
makeImportant() should not be static function