gitconfig: always enable reflogs.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
gitconfig: add name.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
zshenv: don't override git's author email.

We might be committing a patch from someone else and we wouldn't want to
override that user's email.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>