Fix issue 3

Fixes https://github.com/nsue/multiplayer-breakout/issues/3
Revert BRICK_ROWS and BRICK_COLS to production values
Merge pull request #4 from nsue/fix-issue3-continuing-after-gameover

Fix issue3 continuing after gameover
Fix issue 6: Add random ball release x velocity
Merge pull request #8 from nsue/fix-issue-6

Fix issue 6: Add random ball release x velocity