Less compile uses the official node.js version of Less 1.7.0 for auto-compiling .less files on save.
The less file is compiled into a compressed .css version in the same directory as the .less file. E.g. styles.less -> styles.css
The auto-compile is only triggered on files with the .less extension.
less:compile - This is the same as simply saving the file.
ctrl + alt + L