Address issue with permissions

Seems like the permissions issues have cropped up again. It used to be that everything would run as the `jupyter` user once USER was invoked. That appears to be no more.

```
$ ls -la /home/jupyter
total 56
drwxr-xr-x 13 jupyter jupyter 4096 Sep 27 20:37 .
drwxr-xr-x 15 root    root    4096 Sep 27 20:37 ..
-rw-r--r--  1 jupyter jupyter  220 Apr  9 01:03 .bash_logout
-rw-r--r--  1 jupyter jupyter 3637 Apr  9 01:03 .bashrc
drwxr-xr-x  2 jupyter jupyter 4096 Sep 27 20:37 .ipynb_checkpoints
drwxr-xr-x  9 root    root    4096 Sep 27 20:22 .ipython
drwxr-xr-x 11 jupyter jupyter 4096 Sep 27 19:52 ipython_examples
drwxr-xr-x  6 root    root    4096 Sep 27 20:22 .julia
-rw-r--r--  1 jupyter jupyter  675 Apr  9 01:03 .profile
drwxr-xr-x 37 jupyter jupyter 4096 Sep 27 19:51 .R
-rw-r--r--  1 jupyter jupyter   41 Sep 27 19:46 .Renviron
-rw-r--r--  1 jupyter jupyter   60 Sep 27 19:47 .Rprofile
-rw-------  1 jupyter jupyter  919 Sep 27 20:37 Untitled0.ipynb
-rw-r--r--  1 root    root    2209 Sep 27 19:24 Welcome.ipynb
```

This just tries to `chown` through `/home/jupyter` as well as setup a notebooks directory for easy collaboration on the notebooks.

![screen shot 2014-09-27 at 4 13 31 pm](https://cloud.githubusercontent.com/assets/836375/4432220/d3e8d40c-468b-11e4-9f54-348eb88e1def.png)