Added the ability to shoot arrows

Credit to ljyloo (http://forums.pocketmine.net/index.php?threads/shooting-arrows-in-pm-server.508/#post-4338).
Fixed typo. Not Longer -> No Longer
Update config.php
Fix #871
Fix /me @all critical server crash bug. Fix #840. Disabled usage of @all for non-ops.
Fix 805
Fix crash bug when @all is used in console.
Fix #831
Merge pull request #1 from PocketMine/master

Pull from Upstream