add date
git diff を賢く
remove cp/mv -i alias
[git] cancel, cancel-all
[git] use ISO 8601 format for commiter date
[git] show refs
[git] use diff-hilight
[git] update sweep-branch
[zsh] rvm seppuku
[zsh] add alias `lsd`
[zsh] add global alias `CSU` for listing unique files with `grep | grep`

usage:

```
$ grep -r TODO . | grep user
./app/views/users/show.html.slim:/     td TODO: 未実装
./app/views/users/show.html.slim:/   p TODO: 未実装
./app/models/user.rb:  include User::CommentModule # TODO: has_one を使う
./app/controllers/users_controller.rb:    # TODO: 未実装
```

```
$ grep -r TODO . | grep user CSU
./app/views/users/show.html.slim
./app/models/user.rb
./app/controllers/users_controller.rb
```