Delete .cvsignore. It is time.

Change-Id: I3ed51b54252307f387f71955bbf547928bf26b5b
all: update for Git

- rewrite .gitignore to use git patterns
- mv hg(1) to git(1) and rewrite
- add lib/git/commit-msg.hook
- add skeleton codereview script
- update codereview(1)

Change-Id: I061cd8e4de77ebbd6037a7c5d1582cd1d986f62f
codereview: fix a few bugs

Change-Id: Ifd9fda05e15c9e1e106ffd4e30e1dafe8423cdf4