Statinf

Here's the new course on Statistical Inference. It follows Brian's slides and lectures closely. 
The big innovation in this course is plotting jpeg images in the plot window. This requires the package jpeg to read in jpeg images and then uses the rasterImage function to plot them. This allows us to display math formulas (from latex), charts, and any images grabbed with a screenshot (e.g., from a webpage). Examples of this are in 3 lessons (Variance, T_Confidence_Intervals, and Multiple_Testing.)
There's also a new custom test, obliterate, in the Resampling lesson. This lesson required generating several large arrays and swirl's performance visibly slowed. The new custom test removes the large arrays from the global environment and e$snapshot when they're no longer needed to eliminate the lag.