Implemented a new 'Package checker'

+ New 'package checker' fetches the usernames of all players with
commands waiting to be executed (At a higher frequency than the previous
package checker)
+ Any of the fetched players which are online have their commands
fetched and executed
+ If commands which do not require players to be online are queued to
run those are fetched and executed
Merge pull request #20 from ShadowDog007/master

Implemented a new 'Package checker'