Retrieve ProductBiddingCategory slice from API

Merge pull request #28 from zak10/master

Retrieve ProductBiddingCategory slice from API

Close Response Body

Make sure we are calling defer resp.Body.Close() on things to avoid leaking connections.

Adding FeedItemExtensions

Only CallFeedItem extension is implemented

Adding TargetingIdeaService

Merge pull request #25 from colinmutter/feature/targetingIdeaService

Feature/targeting idea service

Adding v201609

Merge pull request #24 from colinmutter/feature/v201609

Feature/v201609

Bugfix for BatchJob and CampaignCriterion

CampaignCriterion was coming back nil from BatchJob response. Needed to update it to unmarshal to CampaignCriterions instead of CampaignCriterion.

v201607

Merge pull request #22 from colinmutter/feature/v201607

add v201607

v201605

Adding v201605 version.
Adding Expanded Text Ads

Add Campaign Criterion Query Method

Merge pull request #19 from colinmutter/feature/campaignCriterionQuery

add campaign criterion example and query method