Merge pull request #6 from adletaw/master

Added folder hierarchy
Merge pull request #1 from aammd/master

Get changes from upstream
Add Jenny's notes for DataStructures
Merge pull request #8 from jennybc/master

Add Jenny's notes from reading DataStructures
Merge pull request #2 from aammd/master

Get changes from upstream
Info re: get upstream changes into fork via GitHub
Merge pull request #9 from jennybc/master

Add info about keeping a fork synced