[Pyublas] add bool converter

[Andreas Kloeckner]

j#part sign=pgpmime>
On Wed, 9 Feb 2011 10:55:20 -0500, Neal Becker <ndbecker2 at gmail.com> wrote:
> Works for me:
> 
> +  expose_converters<bool>();

Ok, why not. We'll see if anything breaks.

Andreas