Merge pull request #30 from bcaffo/master

Added some shiny stuff
recompiled 03_04
Fixed some errors
Added some figures
Added a bunch of pdfs
Added some lecture files
Merge remote-tracking branch 'upstream/master'
Merge pull request #35 from bcaffo/master

Trying again, should be able to merge now
Added hw3
Added a fourth hw
fix homework 1 question 1, which basically was missing a negative sign
fixed homework 1 question 1 - another problem
fix homework 2 slide 8 typo.  lower.tail=TRUE changed to FALSE
fix homework 2 slide 12 question - typo with parens and s/100/10
Merge branch 'master' of https://github.com/bcaffo/courses into inference
Merge pull request #4 from TroyOfHelen/master

fix homework 1 question 1, minus sign and concept
Merge pull request #1 from bcaffo/master

Catching all updates