Reduce sources of inconsistent naming

[adjavon]

In the current tutorials and set ups for doing attribution and evaluation, we name things via proxy by using dictionaries like:

attributions = {"discriminative_dl" : DDeepLift(classifier)}

Since these names are used later to name dictionaries/processes, it would be nice if we directly used the name of the attribution we used. I'm envisioning something like:

# The version in a config file
attributions = ["DDeepLift", "DIntegratedGradients"]
# The version in a script
attributions = [DDeepLift, DIntegratedGradients]

We could both get attributions by name, or get a name from an attribution object. This could be extended to things like the processor used, etc. This could make naming conventions more consistent across runs.