burp2xml update

I'm using burp2xml in a project I'm doing.
I needed it to work a little differently, so I decided to fork and do some mods.

I left the default behavior the same, but made these changes:

* use OptionParser for getting options
* added -n option to keep non-printable characters
* added -v for verbose output
* avoid failure on bad dates
* handle stdout reporting correctly

I also added a setup.py

I have not done thorough testing, but 

J.N. Wilson