add long type support

[lichenbo]

The script will throw an type error exception when it met a long value. I add the long type into the tuple and everything is ok now except it will missing the ending 'L'. But that's exactly what I want.

[quandyfactory]

Thank you. I followed up on your change by including a couple of other places in the code where long had to be added to the list of numberish types and adding a try/except block to handle Python 3, which does not include a long type. Then I abstracted the xml type attribute definition into a separate function. I've pushed the newest version of the code to github if you want to grab it.