The map of earth shorelines, right now too big to use.

	new file:   shorelines.dat
added a forth dimension to the ERQ data display
	modified:   ../../../lib/pre3d.js
	modified:   ../DataPoint.js
	modified:   ../demoUtils.js
	modified:   ../index.html
	modified:   ../tree.js
Merge pull request #47 from smcclure879/master

add fourth dimension to the graphing for ERQ