Merge pull request #4 from jarrodmillman/workflow

Slide rendering
edits to modules
Merge branch 'master' of https://github.com/berkeley-scf/r-bootcamp-2013
took out warning in breakout in module3
Merge pull request #5 from jarrodmillman/workflow

ENH: checkpointing some minor additions
Minor changes to breakout problems in module 5
hopefully final (for Saturday sessions) of all slides/html and modules.zip file
edits to modules0-3, remake zip
ENH: snapshot