Fixed: Changing the "Friction" causes forces to the left to flash incorrect "Sum of Forces", see #77
show the smaller arrow in front (in terms of z-ordering), see #78
Move item to the front when grabbed, see #80
Made man's hands same color as face, see #81
Only update the sum force arrow after both friction and applied force changed, so we don't get partial updates, see #83
Merge branch 'master' into 1.0
updated version to 1.0.0-rc.49