Fix signalCall, healthinfo tooltips

src/framework/core/application.cpp

@@ -152,6 +152,7 @@ void Application::poll()
 
 void Application::exit()
 {
+    g_lua.callGlobalField<bool>("g_app", "onExit");
     m_stopping = true;
 }
 

src/framework/luaengine/luainterface.cpp

@@ -506,7 +506,7 @@ int LuaInterface::signalCall(int numArgs, int numRets)
             }
             pop(numArgs + 1); // pops the table of function and arguments
 
-            if(numRets == 1) {
+            if(numRets == 1 || numRets == -1) {
                 rets = 1;
                 pushBoolean(done);
             }