Merge pull request #51 from JimHokanson/master

Merging Jim's changes back to Openworm
Some changes to make Jim's merge work for me
Update README.md
Update Movement Validation White Paper.md
Update Movement Validation White Paper.md
Update README.md
Update README.md
Update README.md
Update README.md
Working on EventFinder.py
Added write_to_CSV helper function
Small change to write_to_CSV
Added Rick Gerkin's paper to the list
write_to_CSV: add descriptive var names
Update Movement Validation White Paper.md
Update Movement Validation White Paper.md
Standardized the docstrings
Added ability to plot motion codes
Working on EventFinder.py
fixed bug in WormPlotter

... == np.NaN doesn't work, must use np.isnan(...)