Fixed Server->getOps() capitalization

I'm not 100% sure, but I believe this is how it's supposed to be.
Merge pull request #2295 from LukeDarling/patch-1

Fixed Server->getOps() capitalization
Remove duplicated tiles from chunk table automatically
Merge branch 'master' of github.com:PocketMine/PocketMine-MP
Regenerate corrupt player data if invalid data is found
Catch corrupted chunk data errors
Increased Fence, Fence Gate and Stone Wall Y bounding box
Bumped Minecraft: PE version string
Improved exception handling and debugging