Accommodating for the fact that I think the etsy API is strict in terms of how it interprets URLs with just one request parameter.
Merge pull request #2 from seanoshea/master

Altering EtsyRequestManager
Extending the ListingsRequest object to allow an 'Includes' parameter to be passed for the active listings for a particular shop. Allows a client developer to request that images be returned for a shop's active listings.
Merge pull request #3 from seanoshea/master

Small change to findAllShopListingsActive
Accommodating for the possibility of the response being null due to a dropped connection while reading the response.
Merge pull request #4 from seanoshea/master

Avoiding NPEs with Null Responses