Merge pull request #5 from KellyBlack/dev

Candace and Linton Code
Merge pull request #6 from sweenee/dev

Dev
repeated Z to estimate distribution
first draft of INS SDE approximations
simple stochastic integral approximation
fix for left hand sum
first draft of second model approx
iterations of Z with left hand sum
Merge pull request #12 from candaceliu/candace_dev

Candace dev
Merge pull request #7 from KellyBlack/dev

Dev
switch to left hand sum
Merge pull request #13 from sweenee/beth_dev

all three of our changes with left hand sum
Added a copyright notice to the readme file.
Fixed a conflict with a comment in the readme.
Added a readme to the Paper directory.
Added a new readme to the simulations directory
Added the license to the other readme files and cleared up a conflict.
Merge pull request #6 from KellyBlack/dev

Dev
Merge remote-tracking branch 'origin/dev' into candace_dev