Fixing travis build. Somehow xtend type inference mechanism works dif…

…ferent in maven and travis. It sucks

org.uqbar.project.wollok/src/org/uqbar/project/wollok/ui/utils/XTendUtilExtensions.xtend

@@ -129,7 +129,7 @@ class XTendUtilExtensions {
 	}
 
 	def static evaluator() { WollokInterpreter.getInstance.evaluator as WollokInterpreterEvaluator }
-	def static newException(String exceptionClassName, String message) {
+	def static WollokProgramExceptionWrapper newException(String exceptionClassName, String message) {
 		new WollokProgramExceptionWrapper(evaluator.newInstance(exceptionClassName, message.javaToWollok)) 
 	}