Don't cause a memory leak if a world used for protections unloads, make protections work if a world used for protections is unloaded then reloaded.

Signed-off-by: Ross Allan <rallanpcl@gmail.com>
Merge pull request #4 from nallar/master

Don't cause a memory leak if a world used for protections unloads, make protections work if a world used for protections is unloaded then reloaded.