Update version to 4.2
Fix spelling error in MOTD
Add script to prepare configuration files for release
Add tool to manage server resets
Add potatos, carrots and bows to the exchange.  Fixes #43
Add helms to the shops.  Fixes #35
Various updates to the world map

- Add better item detectors for the nexus upgrades
- Add signs to denote the different lanes.  Fixes #40