Controlling means controlling claims, not channels. Added so we only return claims with valid signatures (safer for now, can add options to show invalid later). Also, the claim count in channel is in the signed channel meta object, not the high level one.
Fixed resolving by signed_channel, order for claim search and timestamp to use release date / creation date (to match sorting). We'll probably want to show updated_date somewhere in advanced section eventually.
Needs some flow love
* remove uri from failed purchase uris for a new purchase
* add doDeletePurchasedUri action
* add parseFloat for costInfo.cost
* add purhcaseUriErrorMessage and more failure handling
