Add script to export poster

Update Makefile and makefigs.sh
Add plotting code for figures
Create omnigraffle poster
Add EvaluateObserverTrials function
Update model_lhs in analysis_tools.py
Bootstrap analysis of model likelihoods and figure tweaks

Fix bugs in analyze-stability-learning.ipynb
Poster v2
Merge branch 'publications/cogsci2013-poster' into develop