Sessions between workers

[BenjamenMeyer]

Issue #11 covered most of the functionality relating to Sessions; however, it also determined that at present only 1 worker can be supported since the workers themselves do not actually share any data and behave more like multi-processed units where data must be pickled instead of multi-threaded or cooperative processes where data is easily shared between them. Closing out #11 since it is done aside from that one issue and moving that portion of the issue here for further tracking.