Don't assume command arguments.
Merge pull request #40 from Stebalien/fix-command-no-args

Don't assume command arguments.
Remove the *_padding settings

Setting and getting the monitor padding is now handled by the `-p`
option of the monitor command.
Add mode modifier

Allows selecting windows based on their mode (manual/automatic).  This
is useful for duplicating the old shift-can-be-transplant behavior.

    # Usage: squish DIR
    squish() {
        dir=$1
        bspc window -w ${dir}.manual || bspc window -s ${dir}
    }
Document mode modifier.