Session mods

Some small mods to the session class and the presto class.

In `Presto`, I want to provide access to the `options` when the delegate is constructed.

In `Session`, I provide the ability to pass in a cookie that will be used over other auth methods.

@bruce-alderson 

Related to https://github.com/Discovery-Software/shell.rubrix.com/pull/67 and other XDR CORS work.