Support for @Wire on classes + gwt&gradle compile exception fix.

Everything you need to fix:
junkdog/artemis-odb/issues/63
junkdog/artemis-odb/issues/65

You might want to clean up my changes in World.java, specifically injectValidFields. It can use some beautification.  ;)

Like discussed, this does not support parameters in @Wire, and It goes by convention of wiring up superclasses.