Rename "git ls-ignored" to just "git ignored".

I never remembered the "ls" part.
Update git-wip to the new "git add" behaviour.
Set git HTTPS credential timeout to three hours.
Add log and diffstat to git-branch-pull to show what you just pulled.

I'm liking this quite a bit. It might get overwhelming for big pulls,
I guess, but those aren't all that common.
Add 'git last-week' command to show what I did last week.

Handy to run before Monday morning meetings.