Informs users about too long warp names and failed player teleports,
renamed generated package
Fixed economy disobey permission check
Implemented warp creation dates
dates are implemented via Java's rather poor API. If further functions
are needed, Joda Time (or at some point Java 8) could be used without
changing the whole logic. The altered popularity algorithm is more or
less a shot in the dark and might need further tuning, especially via
the gravity constant.