AndrewAnnex/SpiceyPy: SpiceyPy 2.2.0

This release includes the last of the geometry finding functions that were not wrapped before. A number of user contributions were included and a few simplifications surrounding spicecells were made to make creating them easier. The NAIF produced spiceypy-based "lessons" (long tutorials) have been added to the documentation and both a issue template and code of conduct were added to the project. This release marks the essentially completed wrapping of cspice, functions not wrapped are either not necessary in python (in my opinion) or are the Alpha-DSK backwards compatibility routines (ending in _p102) in N66 CSPICE. Added gfevnt wrapper easier spice cell inits python datetime to et converter issue template code of conduct NAIF python lessons to docs Changed functions that modify a results spicecell now optionally create a return spicecell convrt now "vectorized" prioritized citation info in readme Removed removed anaconda build steps from appveyor, conda-fordge replaces it Fixed newlines in changelo