Refactoring and System Interfaces

Having used the framework in the past few months it became apparent that there was a lack of functionality in a couple areas that required updates to the interfaces that were in place for the initial release (0.1). To help correct this we are in the process of updating these while also incorporating a new ODE solver (CVODE) and enabling node and edge parameters which will make the definition of specific types of experiment much easier! All in all this means that the framework may not be functional for the next few days as we finalise the changes and update previous dependant code.