Create README.md file
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Added discussion on order of convergence of C-N
change from pickle to numpy.load for compatibility across python2.x and 3.x
Merge remote-tracking branch 'refs/remotes/origin/parabolic_dev' into parabolic_dev
update data file address for assessment
Correct module summaries now that they are written.
added comparison with 1st order in time method
Add links to lessons in nbviewer
Add links to lessons on nbviewer
Add links to lessons on nbviewer
Add links to lessons on nbviewer
Update README.md
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Update README.md
Text edit, add video, links in references

Also, author list in alphabetical order.
Edit explanation of GS model

Removing use of "particles" and explaining more the reaction term.
Final edits to reaction-diffusion notebook