IPython cleanup fails with non-standard Client profile

# Problem

The `IPythonClient` instantiation in `cleanup_all` in `ipython_cleanup.py` is problematic since the default profile is used:

``` python
def cleanup_all(module_name, prefix):
""" Connects to all engines and runs ``cleanup()`` on them. """
c = IPythonClient()
if c is None:
return
try:
v = c[:]
cleanup(v, module_name, prefix)
finally:
c.close()
```
# Steps to Reproduce

Create a new ipython profile `distarray`

``` bash
$ ipython profile create --parallel --profile=distarray
```

Start up controller

``` bash
$ ipcontroller --ip='*' --profile=distarray
```

and engine

``` bash
$ ipcluster engines -n 1 --profile=distarray
```

The run the following script

``` python
import numpy as np

import distarray.globalapi

from distarray.globalapi import Context, Distribution
from distarray.globalapi.ipython_utils import IPythonClient as Client

context = Context(client=Client(profile='distarray'))
```