updated vm info in howtos
updated vm instructinos
fixed typo in 3c of ps1
added unit 3 materials; still modifying them...
added unit3 materials plus
the png files for unit2 latex file and niceR.sh for unit2
added unit4 materials;
unit4 still being modified;
finalized unit3
more updated to unit4
updated to sec7 of unit 4
finalized unit4 except sec 8 (regexp)
Add instructions for creating private GitHub repo
Add info on getting GitHub account
fixed typo in unit4
Merge branch 'master' of https://github.com/berkeley-stat243/stat243-fall-2014
added unit5
finalized unit4, namely regex stuff
added ps2.pdf
added unit6 materials
updated unit6