UPC shorting

[redtoad]

Originally reported by Valery Tsarov (Bitbucket: Hamurapa, GitHub: Unknown)

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I have sent a request to API:
result = api.item_lookup(
'009800895250', IdType='UPC')

But in a response I have this:
'UPC': 9800895250

It looks like an Integer.
The same story with EAN. I think you have to return UPC and EAN like a string with all "0".

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• Bitbucket: https://bitbucket.org/basti/python-amazon-product-api/issue/72