Merge pull request #151 from bepetersn/master

add bottom of page breakpoints to leave room for footer
Minor CSS changes, made page content narrower
Merge pull request #153 from bepetersn/master

fixes #140; add content to homepage table of contents
Merge pull request #154 from bepetersn/master

changed flowchart attribute from a class to an id for the 10th time
fixed merge conflicts
Merge pull request #152 from sarahelizabeth/master

Minor CSS changes, made page content narrower
turn off expanders