css and less directories?

[robertandrews]

Just re-installing my WPBS download to ensure cleanliness after modification, I see the "wordpress-bootstrap" directory contains two folders that don't come with the latest theme download... "css" and "less".

I don't recall why they are there...

"css" contents:

• bootstrap.css
• mixins.css
• old
• responsive-utilities.css
• responsive.css
• utilities.css
• variables.css (timestamp mostly Aug 9, 2012 @ 0950)

"less" contents:

• 42 *.less files (timestamp mostly Aug 9, 2012 @ 0951)

What are these and why might they be there?

[samjolley]

Is there a way to get the css folder and contents?