Revert "Fixes #189, ensure the package is in the meteor 'packages' file when adding."

I'm removing this because

a) I don't think we should actually be doing this. There are legitimate use cases for having packages in smart.json but not in .meteor/packages.

b) It also breaks running tests on real packages (they don't, and shouldn't, have a `.meteor/packages`).

Sorry @kidovate!

This reverts commit eba23ddcb57b5069b551e45b56212e30dbcfc662.