Merge pull request #1 from xtitter/gh-pages

stuff we talked about on 4 --- the max block stuff, notes in 4.topic, etc.
added new topic 4 files.
:x
Topic 4 changes
more topic 4 changes
even more topic 4 changes
fixing links in topic 4
fixing pic links in topic 4
fixed valid-date pic
adding new brick wall page from brian
fixing topic page
fixing topic page
fixing brick wall
fixed wording on input types page
added snap span tags
another brick wall (brians version)
Merge branch 'gh-pages' of http://github.com/beautyjoy/bjc-r into gh-pages
Merge pull request #204 from aaaschmitt/gh-pages

Topic 4 files