I installed: https://github.com/appden/less.tmbundle and the lessc compiler and it seems to work (no errors) but I don't see a compiled .css file.
To change the filename from less > css, just use a simple replacement:
Leaving the verbose flag will result in a nice feedback message stating your file has been saved to xxx.css.
I edited the bundle command to this:
And now it works. But it saves a file (sample.less) to sample.less.css which is ok but not ideal.