Created by: richardp-au
Set @responsive variable in variables.less to true and responsive.less will be compiled into bootstrap.css.
Alternatively, set the variable to false (default) and everything is as before (i.e.: compile responsive.less yourself or don't bother at all).
This pull request is based on issue #2796 (closed). I finally got around to making my own fork so I could create pull requests instead of being lazy! :)