minor fixes
Merge branch 'master' of https://github.com/215ALab4/lab4

Jonathan's files
Merge branch 'master' of https://github.com/215ALab4/lab4
Merging online files
Merge branch 'master' of https://github.com/215ALab4/lab4
Online merge
Merge branch 'master' of https://github.com/215ALab4/lab4
Merging online files
Merge branch 'master' of https://github.com/215ALab4/lab4
Jonathan's edits continued
Merge branch 'master' of https://github.com/215ALab4/lab4
Jonathan's pdf edits
graphics reorganized, directory outputs specified
Merge branch 'master' of https://github.com/215ALab4/lab4
Online files