Small fixes to Sku and Shipment classes#146

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bc-jz wants to merge 3 commits into

bigcommerce:masterfrom

bc-jz:small_fixes

Commits on Jul 8, 2015

Removed the options() method from Sku class as the 'options' property on a Sku object is an array of option objects, it is not a reference to a separate resource as this method expects.
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Removed 'shipping_methods' from the ignore fields and added 'billing_address' and 'shipping_address' - this makes the PHP library match the API requirements
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Commits on Jul 9, 2015

Removed the test of the options() method from SkuTest.php. Deleted SkuOption.php and SkuOptionTest.php as these don't match with API v2 schema.
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