Update Agenda.md
update chapter-2 code style
Merge pull request #1 from iambowen/patch-1

Update Agenda.md
tiny fix to chapter-2
Update Agenda.md
change filename to README.md
Update chapter-3
Update chapter-2.md homework url
Update chapter-3 and CSS.
Update chapter-3 and CSS
Fix ruby-block error
update reveal.js
rename md files. 01 -> 1