added a generic interface to handle all types of events with a simple
interface : eventName and handler. On anyJqmWidget you can do
:addJQMEventHandler( String eventName  ,JQMEventHandler handler);
The use of this arose when trying to change a callback form "tap" to
"vclick" .I had to add this functionality to jqm4gwt and recompile
jqm4gwt then recompile my project instead of changing from "tap" to
"vclick" in my project.
Merge remote-tracking branch 'andrei_local/master'