Merge pull request #10 from KellyBlack/dev

Merge the line art for the approximation and the csv example in R.
R write to csv file
R change of loop
First draft of the matlab file to make a movie.
edits for same W (euler)
scale down g
Updated the movie example to produce a matlab movie and tweaked it to optimize the movie's appearance.
csv file (euler)
Checked the spelling of the latex files.
Merge pull request #25 from KellyBlack/dev

spell check
R change in loop
Merge pull request #11 from KellyBlack/dev

Performed a spell check on the latex files.
added picture and small edits
Merge pull request #37 from lindongzhou/linton_dev

Linton dev
Merge pull request #38 from sweenee/beth_dev

added picture and small edits
R write to csv file
R change of loop
R change in loop
added picture and small edits
Merged changes from Beth and Linton.