added some physics materials, added block mass/size options and random drop positions.
using dev builds of three.js and cannon.js.
using 2 half-steps per frame and increased solver precision for added physics 'realism', lowered player mass so that it cannot displace larger objects.
implemented a 3rd person follow-cam (use mouse to look around).
fixed follow-cam, disabled orbit controls (until they are fixed also).
forked OrbitControls to custom variant.
enabled cameraLookAround on mousedown event (movement keypress switches to follow-cam).
minor follow-cam FOV adjustments, added controls hint in HTML page title.
merged mousedown event code into myOrbitControls.
Merge pull request #1 from joates/dev

merge: dev into master