Updating the main page.
Adding Adam's solutions to exercises 2.1
Merge branch 'master' of https://github.com/abgoldstein/ccaejs into gh-pages
Fixing a bug in adam's week 2 code.
Correcting a typo in adam's week2 code.
First draft of week2
Merge branch 'master' of https://github.com/naclsweet/ccaejs
Merge branch 'master' of https://github.com/abgoldstein/ccaejs into gh-pages