Upgraded testing suite

[nikhar-abbas]

This pull request primarily includes a more rigorous testing suite for the NREL 5MW land based wind turbine and the IEA 15MW UMaine Semi-submersible model. This was initially pulled from @dzalkind's updates on his master branch of the ROSCO toolbox.

Major Updates:

• Include ROSCO_testing suite.
  • ROSCO_testing.py: Contains "lite", "heavy", "discon comparison" and "rosco comparison" functionalities for different testing purposes.
  • run_Testing.py: A script to run various test scripts.
• Test_Cases folder updated to have two turbine models - NREL 5MW land based, and IEA 15MW floater
• Include example 11 for generation linearized models using ROSCO_toolbox and AeroelasticSE tools

Minor Updates

• Examples 06 and 08 modernized a bit
• Minor bug fixes in setup.py

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To-do:

• [ ] A Jupyter notebook (or similar) to do more rigorous post processing of the tested controller would be super helpful
• [ ] An update to the readme with instructions for the standard user to test ROSCO. Perhaps a "baseline" case for run_Testing.py will suffice.

[nikhar-abbas]

I'm closing this because these changes have been included in an updated pull request, #21, and the matlab-related updates have already been merged in #17.