Working on adding curvature.
Now that I can compile, some obvious bugs fixed.
Working on Haddocks with diagrams!
Switched to PosInf representation.
Merge pull request #74 from fryguybob/curvature

Working on adding curvature.
bump upper bound to allow base-4.7
depend on data-default-class alone, since we don't use instances
Merge branch 'master' into scaleinv-prim