Update .gitignore

Some specific settings for scripts I use

Change-Id: I020072478dd1b484a76cc527772041737992fd5b
Reviewed-on: http://review.couchbase.org/26397
Reviewed-by: Mordechai Nunberg <mnunberg@haskalah.org>
Tested-by: Mordechai Nunberg <mnunberg@haskalah.org>