Merge pull request #12 from KellyBlack/dev

Merge the line art for the approximation and the csv example in R.
Merge pull request #11 from KellyBlack/dev

Merge the line art for the approximation and the csv example in R.
presentation edits
Merge remote-tracking branch 'origin/dev' into candace_dev
commented out plot commands
Merge remote-tracking branch 'origin/milstein' into candace_dev
Merge pull request #33 from candaceliu/candace_dev

Copy over the updated presentation and the update to use the Milstein method.