Missing session argument in Admin constructor

[fjbosch]

When initializing an Admin object, it is sometimes desired to include some custom connection. For the stardog.Connection object that is possible by first creating a requests.Session object and providing it to the constructor of stardog.Connection. However, stardog.Admin accepts similar arguments as Connection, but it does not take a requests.Session as an argument.

I think Admin should be consistent with Connection and accept a session as an argument. It is also needed for custom connection requirements for both Admin and Connection instances.

0001-Add-a-request.Session-argument-to-Admin.txt

[scardena]

you are right, we should add a custom Session object to the admin class too. Please feel free to submit a PR. If you have time, writing a test for it will be highly appreciated.