v1.5.0

sourcemap support
support for import inline option to include css that you do NOT want less to parse e.g. @import (inline) "file.css";
better support for modifyVars (refresh styles with new variables, using a file cache), is now more resiliant
support for import reference option to reference external css, but not output it. Any mixin calls or extend's will be output.
support for guards on selectors (currently only if you have a single selector)
allow property merging through the +: syntax
Added min/max functions
Added length function and improved extract to work with comma seperated values
when using import multiple, sub imports are imported multiple times into final output
fix bad spaces between namespace operators
do not compress comment if it begins with an exclamation mark
Fix the saturate function to pass through when using the CSS syntax
Added svg-gradient function
Added no-js option to lessc (in browser, use javascriptEnabled: false) which disallows JavaScript in less files
switched from the little supported and buggy cssmin (previously ycssmin) to clean-css
support transparent as a color, but not convert between rgba(0, 0, 0, 0) and transparent
remove sys.puts calls to stop deprecation warnings in future node.js releases
Browser: added logLevel option to control logging (2 = everything, 1 = errors only, 0 = no logging)
Browser: added errorReporting option which can be "html" (default) or "console" or a function
Now uses grunt for building and testing
A few bug fixes for media queries, extends, scoping, compression and import once.