Add some missing files to .gitignore.
Push Documentation/.gitignore down into subdirectories.
Signed-off-by: NPeter Foley <pefoley2@pefoley.com>
Signed-off-by: NRandy Dunlap <rdunlap@infradead.org>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>