Loading wait from rootpy.interactive loads ipython console

Hi all,

I am not sure if this is a bug, but when I want to import the wait function from rootpy interactive, the ipython console is loaded

```bash
$ python
Python 2.7.3 (default, Oct 14 2012, 01:45:23) 
[GCC 4.2.1 Compatible Apple Clang 4.0 ((tags/Apple/clang-421.0.57))] on darwin
Type "help", "copyright", "credits" or "license" for more information.

>>> from rootpy.interactive.rootwait import wait
WARNING: IPython History requires SQLite, your history will not be saved
In : 
```
This is clearly inconvenient if you don't want to use iPython (and in scripts, I get the ugly SQLite error), but maybe it's intended... If it is, sorry for the noise!

Albert