Merge pull request #1 from bcaffo/gh-pages

merging
updated jeff's lectures
Typo in Lec 01-01-03, Afriad -> Afraid
updates
Merge pull request #19 from kbroman/master

Typo in Lec 01-01-03, Afriad -> Afraid
Edited the project file. It's still different on Coursera
Added the hunger.csv file
Merge pull request #23 from bcaffo/master

Merging gh-pages and master
Merge branch 'master' of github.com:DataScienceSpecialization/courses

* 'master' of github.com:DataScienceSpecialization/courses:
  Added the hunger.csv file
  Edited the project file. It's still different on Coursera
  updates
  Typo in Lec 01-01-03, Afriad -> Afraid
  updated jeff's lectures