This prevents Travis CI from having to hammer the JPL servers when
testing jplephem against several versions of Python at once. It
will also stop CI from routinely erroring out one or more versions
of Python when the JPL’s servers happen to drop a request.
Now that the main point of this package is the "jplephem" module for
reading SPK kernels, we should go ahead and promote it to being a top
level directory.
My cute trick of driving all six of these packages from a single
setup.py proved useless for "tox" which insists on calling setup.py
the normal way, without an extra argument. So everything goes a level
deeper so that it can get its own setup.py.
Brandon Rhodes