Changed update available message
Changed update check handling
Doesn't check for updates if version contains beta, alpha, or snapshot
Fixed NPE related to sending messages to the console
Changed update notice message and look on /simplepromoter version
getVersion() will call updateNeeded() if newVersion is null
Tagged some messages, added sendTaggedMessage() method for CommandSender
to prevent NPEs in certain circumstances
Changed version [1.5 SNAPSHOT] (not being released quite yet)
Removed unnecessary isDebug variable value set
Cleanup
Moved, cleanup
Added getMainGroupName method, cleanup
Added containsMultiple method, cleanup
Removed messages variable and unused imports