Determine an appropriate means for specifying stochastic integrals #419
Description
The 'integral' attribute of the KineticLaw is to indicate what integral the diffusion term was designed to be used for. Different integration schemes can have different diffusion terms, which can be translated between each other in some cases, but only if you know which integral it was designed for. The value of the 'integral' attribute will be a KiSAO term, allowing future expansion for tools using different integrals that are not known today.