Add 'filter' attribute and external filter driver definition.

The interface is similar to the custom low-level merge drivers.

First you configure your filter driver by defining 'filter.<name>.*'
variables in the configuration.

	filter.<name>.clean	filter command to run upon checkin
	filter.<name>.smudge	filter command to run upon checkout

Then you assign filter attribute to each path, whose name
matches the custom filter driver's name.

Example:

	(in .gitattributes)
	*.c	filter=indent

	(in config)
	[filter "indent"]
		clean = indent
		smudge = cat

Signed-off-by: Junio C Hamano <junkio@cox.net>

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