Added toolbox lecture, hopefully just to jeff
started on data science toolbox
toolBox almost done
Fix a typo
Merge remote-tracking branch 'origin/master'

* origin/master:
  Remove ridiculous hack needed to get S4 to work in slidify
  Don't track PDF version of slides
Start lecture on using the R profiler
Start the process of creating new directories for using dev version of slidify
Libraries directory from dev slidify
Copy over old CSS file to preserve look
Move loading/installing packages to new dev directory
Revise paths to libraries/assets
Fix paths to images
Merge pull request #12 from seankross/master

added markdown lecture
Merge pull request #13 from rdpeng/reorg

Reorg of roger's lectures to deal with showing methods/classes in his lecture
Merge pull request #14 from jtleek/jeff

added toolbox lecture
typos
added mathNotation lecture
Merge pull request #15 from jtleek/jeff

Added lecture on math notation in R markdown
Merge branch 'master' into profiler

* master:
  added mathNotation lecture
  typos
  Fix paths to images
  Revise paths to libraries/assets
  Move loading/installing packages to new dev directory
  Copy over old CSS file to preserve look
  Libraries directory from dev slidify
  Start the process of creating new directories for using dev version of slidify
  added markdown lecture
  toolBox almost done
  started on data science toolbox
  Added toolbox lecture, hopefully just to jeff
Put lecture on profiler in dev directory