Reviewer recommended revisions #1

Occurrences now spelled correctly on histogram plot
Many modifications to support large datasets have been removed. They
introduced some bugs that I would rather not track down. These bugs
should be fixed in the development branch.
Fixed data loading failing due to changes in underlying Shiny functions.
Heatmap function changed to use annHeatmap2 directly
Plot options added to heat map
Walkthrough added to guide new users.
Reviewer recommended revisions #2

README file format changed to markdown
New help file structure for “about” and “data” sections