feature request / patch: ls colors for directories

[Kirk Kelsey]

The "ls --color" option currently colors all normal directories alike.  
On some systems (e.g., darwin) directories with specific name  
extensions are used for specific purposes (application bundles,  
library frameworks). It would be helpful if 'ls' could differentiate  
these directories. I realize this may be a fairly niche feature but  
the changes to the code are few; essentially just extending the  
current extension matching to directories.

I've attached a patch that allows a directory to match an LS_COLOR  
defined extension. Directory extensions are kept separate from file  
extensions by including a final '/' so that a directory named  
'foo.txt' would not be colored as a text file. As an example,  
including "*.app/=00;32" in the LS_COLORS environment variable will  
cause 'ls --color' to make any directory with a name ending in ".app"  
to be colored green without changing the behavior for other  
directories or files with names ending in ".app"

Thanks,
Kirk

ls.c.diff
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