support api-keys (or other params) in the url provided in "Open Url"

[df-jsykes]

if a param is passed in the url in "open url" in the query string, pass that along with each subsequent request to the apis below the root json.

Test URL:

https://dsp-todo.cloud.dreamfactory.com/rest/api_docs?app_name=swagger

app_name being the "api key" with a value of swagger. Currently only the first GET passes this.