comment fixes, README updates, remove extra sympy imports

[phiat]

👍 Thanks for posting this project 👍.
Trying to learn some of the techniques and ended up fixing some minor spelling and comment formatting. Only non-comment change is removing an extra sympy import.

did:

• capitalize and space out comments (did not capitalize commented code)
  • #this function does x ... -> # This function does x
• fix minor spelling and grammar
• fix other minor comment inconsistencies
• add TODO # TODO: Fix this to work with the other variables constant (S_gen_sym.py)
• add wiki link for Pareto Frontier to README
• fix README example verbiage to match example parameters (30 vs 60)
• remove extra sympy imports (Edit: noticed this is in a few functions. Only removed one instance. still need to remove others)
• add MIT license badge to README
• convert some """ multiline comments """ -> # single line
• add newline to start of multiline comments

did not:

• remove these lines (maybe you want them) ###############################################
• change wording of author(s)
• remove: # In[2]: (get_pareto.py:44)

questions:

• where is: "ai_feynman_example.py contains an example of running the code on some examples (found in the example_data directory)" ?
• would you want a little more thorough code reformat / refactor (move hardcoded strings/paths to config)? I am not a python guru, but will give it a go.
• is this repo meant to be maintained somewhat (are you accepting PRs)? Or should I just fork and run with it? Thanks again