Update announcements/syllabus
Your first function
Merge branch 'master' of github.com:DataScienceSpecialization/courses

* 'master' of github.com:DataScienceSpecialization/courses:
  Added more lecture pdfs
  added another lecture file
  added another lecture file
  added some lecture files
  Changed the grading file and added a nojekylle file for gh-pages
  changed the grading page
  Small additions to grading file
  Added announcement and syllabus and grading files
Add Week 2
Modified lecture slides
Add PDF slides
Add PDF slides for knitr
Merge pull request #11 from rdpeng/master

More RR stuff