add Less_Output.php and adjust genCSS() calls
remove outputadd()
remove unused Less_Cache.php
add sourcemaps
Merge branch 'master' into 1.6

Conflicts:
	lib/Less/Environment.php
fix order of sourcemap sources
Merge branch 'master' into 1.6
correct arguments for Less_Tree_Element
pass $currentFileInfo to Less_Tree_Quoted
ignore adding empty strings
sourcemap testing
fix isMathOn() and check for relativeUrls
remove Util.php
remove naive setters/getters
remove unused code
sourcemap options changed to reflect options in less.js
fix getSourcesContent
remove sourceMapOptions array
remove unused php file
relativeUrls default to true, update less.php.combine