ebf78f2 Add SlugSquareFoot and SlugSquareInch (#482)
fe8b3e9 Split ParseUnit(string, string) into WRC and NetFx codegen
a4e4768 Obsolete From unit methods were not being marked as obsolete (#491)
b06a9c3 Obsolete nullable methods (#486)
a46a4c0 Change extension methods to use generics
