Merge pull request #6 from swryan/dev

checkpoint with new Aero & AeroStructural assemblies (with Aero tests)
Merge pull request #7 from swryan/dev

add a 'Results' component to AeroStructural assembly so it fully tracks HeliCalc.. (with tests)
Merge pull request #8 from swryan/dev

add FixedPointIterator to AeroStructural assembly
Merge branch 'master' into dev
clean up some comments