cabbage-bundle-list-mode for display bundles

I found the `cabbage-list-bundle` function at the weekend, but wasn't that happy how it was displayed. 

I realized that `list-buffers` or `list-processes` display really nice table like lists, so I went a bit into the code and documentation and tried to realize something in the same manner for cabbage.

The `File` column is defined as `follow-link` and is clickable, so you get straight to the `bundle.el` file.

@senny what do you think?

![Cabbage Bundle List](http://i.imgur.com/pRMYxs9.png)
`tabulated-list-entries` is a buffer-local variable defined via [`defvar-local`](http://git.savannah.gnu.org/cgit/emacs.git/tree/lisp/emacs-lisp/tabulated-list.el#n69) macro:

```
defvar-local is a Lisp macro in `subr.el'.

(defvar-local VAR VAL &optional DOCSTRING)

Define VAR as a buffer-local variable with default value VAL.
Like `defvar' but additionally marks the variable as being automatically
buffer-local wherever it is set.
```