Add notebook for generating figures

Add mathpsych 2013 figures notebook to makefigs
Add effect of mass on stability omnigraffle figure
Add belief updating omnigraffle figure
Update Makefile and add scripts to compile/serve slides
Add reveal.js submodule
Add slides notebook
Update presenter notes
Minor fixes for screencast presentation
Merge branch 'publications/mathpsych2013-talk' into develop
Merge branch 'develop'