Corrects applicable Python versions for PyPi deployment
Corrects installation instructions, and makes the animaltrade example requirements reference the general KGCN requirements
Fixes the broken link to the animaltrade example in the KGCN README
Prints warnings at runtime to warn the user that the TensorFlow Hub module used may take some time to download, so that they know the process hasn't hung
animaltradeexample requirements reference the general KGCN requirementsanimaltradeexample in the KGCN READMEAddresses #37 #38