cherry-picked improvements + fixes from jr/mnist (including compat fixes for v0.6) #47
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It makes sense to pull out some of these changes from the jr/mnist branch and merge them separately (after which I'll rebase jr/mnist on top of master). This way, I can focus on some of the compat fixes we need for v0.6 without getting tied up in the MNIST example.
There's still some convert issue on v0.6 I need to fix, and I also need to tag new versions of Calculus and ForwardDiff (so I can bump the version requirements here).