Remove Lifted and its uses. Works aside for (<**>) in Mode (ComposeMode f a s)
midway through refactoring to remove TH
added missing instances header file
Merge branch 'master' of https://github.com/alang9/ad into unlifted

Conflicts:
	src/Numeric/AD/Internal/Classes.hs
	src/Numeric/AD/Internal/Composition.hs
eliminated Primal and Internal.Var