Fixed all the GET parameters

Huge caveat of using Apiary.io. They finally [have support](http://support.apiary.io/knowledgebase/articles/106871-uri-templates-support) for GET parameters: it's not the best, but it's still pretty good.

This commit puts all the GET parameters in the request URL like they should always be. This includes mainly the parameters `license_key`, `api_key` and `api_secret`.