Release 0.4.0, 9/19/2020

Significantly added to online documentation
Major code reorganization
- exception management for Individual has been moved to RobustIndividual
- DistributedIndividual now inherits from RobustIndividual
- core.py has been broken out to separate modules
  - Individual and RobustIndividual now in individual.py
  - representation specific entities moved to new sub-packages, binary_rep
    and real_rep
  - Representation now in representation.py
  - Decoder now in decoder.py
- documentation, doctests, examples, Jupyter notebooks, and unit tests updated accordingly
added ability to pass ancillary information during evaluation, such as UUIDs
that could be used to name output files and directories, yet do not have a
direct impact on fitness

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