Fixes to export options

[justin-chandra]

Hello,

I was experiencing a few errors when trying to use the export options so I tried fixing them myself. I am not very experienced with python, I just kept following the errors and making changes that seem fix things.

To me it looks like later versions of python caused compatibility issues leading to most of the problems. The changes I made are as follows:

• xlsxwriter does not accept StringIO anymore - to fix I changed to BytesIO
• collections.Mapping does not work anymore - to fix I changed it to collections.abc.Mapping
• parameters = json.loads(parameters_json) was returning a TypeError so I just made it an except all

Please take a look and let me know what you think. I am open to friendly suggestions and advice.

Thanks

[justin-chandra]

@guysoft Can you please take a look? Thanks for your time

[guysoft]

Tested and looks like it works, I think its worth releasing a new version for this