Add .hgignore file to quiet down "hg stat".

(cherry picked from commit cf451d861f7b31fea06d958e5be22d01aa83021c)
Signed-off-by: Bruce A. Mah <bmah@es.net>
Try to convert .hgignore to .gitignore.

(cherry picked from commit 445a25c0591a82772ad03513af1fabe494731ffd)
Signed-off-by: Bruce A. Mah <bmah@es.net>