Start defining structs and wrappers for Shopify APIs#1

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alecha wants to merge 9 commits intorapito:masterfrom

Commits on Jan 29, 2016

adding first orders-related structs and wrappers
alecha
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added the first basic product's wrappers
alecha
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updated README and added product variants and images wrappers
alecha
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Commits on Feb 1, 2016

updated wrapper for using a common method, README cleaned
alecha
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removed empty test file
alecha
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added GetWithParameter method
alecha
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completed order's wrappers
alecha
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Commits on Oct 31, 2017

add support for discount code
alecha
committed

Commits on Dec 22, 2017

update model
alecha
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