Admin Shops are basically the same as infinite shops, but the vendor
won't get money and won't get a message if someone bought from or sold
to it.
As I rewrote the buy and sell methods, I also fixed a bug that you had
to pay even though you didn't have enough space in your inventory and
that the vendor had to pay even though his shop's inventory was full
- Fixed Update Checker after reload
- Fixed Update Checker on Minecraft 1.9
- Hoppers shouldn't suck items out of a shop's chest (configurable)
- Hoppers shouldn't pickup a shop's floating item
- Shops shouldn't get destroyed by an explosion (configurable)
