Intersection shapes, intial raycaster code
fixed Raycaster closure bug
initial raycaster mouse selection click handling
click atom selection callbacks (atom selection still a little buggy)
don't reinitialize raycaster on each click
fixed intersection sphere bug
cylinder intersection shape handling; bond stick click selection
raycaster line intersection shape handling; selection for line and cross render
add labels test in testgl.html
Merge pull request #4 from nbr2/master

selection handling