Updated code for performance. Moved one-time runs to beginning of code. Used Plot instead of ggplot2 for plotting results (not as pretty, but much faster!?)
Merge branch 'master' of https://github.com/mikebirdgeneau/DEM_shiny_lighting

* 'master' of https://github.com/mikebirdgeneau/DEM_shiny_lighting:
  Create README.md