First pass at invalidateRect - Needs work other entities disappearing
Slightly modified invalidRect call
Dropped redrawEntities - using canvas clip to reduce rendering computation
Disable jump anytime hero has an upward velocity
Added bird - first pass at animating sprites
Health repainted
Throwing rock - commented source - animating monster
Added machine - transform to Block - Block jumps to kill enemies
Fixed bug in invalidateRect
Fixed rock bug - moved health meter