Add rudimentary gravity to particle class
Merge pull request #66 from bisutun/gravity

Add rudimentary gravity to particle class
Fix player disappearance bug; resolve #59
Merge pull request #67 from bisutun/player-bucket-collision

Fix player disappearance bug
Delete particles on collision with goalBucket
Merge pull request #68 from concreted/delete-particles

Delete particles on collision with goalBucket
stick spins but does not hit things downward
particles slope off of stick
particles slide off at a slope
Merge pull request #69 from NickStefan/minYparticles

particles slide off at an angle