Updates to data frames tutorial: switch from plyr to dplyr (cleans up code nicely!)
Add --vanilla to Rscript call to knitr
Make data frame and matrix pages visible.
Fix typos and update plotting modification to use mutate() rather than simply adding a column.
Don't load MASS just to get a simple data file. Instead, teach the students to load data files, at least once.
change name of rake command for compiling less to "lessc"
Update error/404 to new theme (should have been done a while ago!)
New table formatting options.
Update to table formatting to add theming from bootstrap
Rerendering and adding cache to ignore list.
formatting updates (color changes to match BMC...)