Removed Panel Kludge from Pickle/Msgpack tests
@jreback @jbrockmendel 

Recreated pickle file for 0.20.3 using Python 3.5.2 on Mac. Created msgpack file anew (previously 0.19 was last version tested)

Lots of follow ups can be done here including:

  - Automatically generating one of these files as part of build process
  - Decoupling script from test requirements (fixturization and break off)

Can also add more platforms / versions here as required but this should be a good starting point