Update version of ByteCart to 1.4.5
Adapt to ByteCart API v1.4.5
Register listener only if an updater was created
Instantiate and keep track of a RegionBuilder by updater instead of a
static RegionBuilder
Modify the way to watch an inventory open event
Release 1.0.3 for Bukkit 1.5.2-R0.1 and ByteCart 1.5.0
Update version to 1.0.4-SNAPSHOT for development toward next release