Improved performance of component callbacks.
Enforcing tighter time limit on user __gc methods.
Corrected mistake in onConnect/onDisconnect examples in JDoc of Environment interface in API.
Fixed a potential (non-crashing) NPE.
Catching potential errors in __gc methods when persisting computers.
Merge branch 'master' of github.com:MightyPirates/OpenComputers into MC1.7