Use "member" structure for ShippingSpeedCategories

[andrewhavens]

It seems that the "ShippingSpeedCategories" option needs to be structured as a "member" list, like this:

&ShippingSpeedCategories.member.1=Expedited
&ShippingSpeedCategories.member.2=Standard
&ShippingSpeedCategories.member.3=Priority

...despite the fact that the Amazon documentation shows it like this:

&ShippingSpeedCategories.1=Expedited
&ShippingSpeedCategories.2=Standard
&ShippingSpeedCategories.3=Priority

Otherwise, I was getting this error:

Peddler::Errors::MalformedInput (Top level element may not be treated as a list)

[hakanensari]

Thanks, I will merge this in.