Added instructions from the spec to the home page, a new help page, and within the data tables themselves. Removed the old expandable instructions. The new help page introduced duplicate HTML code in the header and footer which would ideally be resolved by generating the header and footer server-side. Added Unicode dropdown arrows to indicate expandable tables.
Hid the instructions from popups, made wording of "datasets/data sets" and spacing around assignments consistent with existing code, and moved a function down.
Fixed a typo in the spec.
Merge pull request #3 from thinkterry/feature/instructions

Add instructions