updated my keplerianlib to work with version 0.1

updaterd references to timelib
fixed some inaccuracies and better integration

Moved the ICRCoordinates class to the positionlib module - I couldn't quite figure out how to use the existing ICRS class in it's place - That's probably a fix for another time.
Also updated some of the test data to what Horizons says now.
updated soem more of the horizons test data
Merge pull request #17 from hoylemd/master

Keplerian orbits