styling tweaks to dialog
+strength option
draws forces with affected radius
Adds key events
Allows url sharing
Allows url sharing
Merge branch 'url-state'

Conflicts:
	canvas.html
Corrected url
Moves javascript libraries to js folder
Adds License for libraries used
Fixes options panel sizing
linked rison project in license
minified rison
Refactored reading options
Adds NUM_STARS & FORCE_DIST to option list
Adds keyboard shortcuts for NUM_STARS
Refactored keyboard shortcut code
keyboard shortcuts for buttons
Adds new option: force calc
Adds option: offscreen behavior