TriangleFit - changed name

Had originally named this TriangleModel. TriangleModel is a much better
name.
Initial commit
Startup - load data files

For some reason, lapply doesn't seem to work with GitHub
TriangleModel

Changed construction of formula
Friedland data

Trivial edits
PlotTriangleModel - ggplot

Switch from base graphics to ggplot2