Add newtonnu.js and spec
Merge branch 'feature/js-sgp4' of github.com:koansys/isat into feature/js-sgp4

Conflicts:
	sgp4/lib/newtonnu.js
Update docs
new jsling definition
Add constastro and constmath under one constants file and test
ignore the setup file
Add the constants spec to the test runner.
convert line endings

I have no idea where these windows line endings are coming from.