extend effect engine with qt image effects (#249)

* - effects now can use qt image effects
- rainbow swirtl is now suitable for any led layout - including matrix

* fix rainbow effect

* effect: add radialGradient

* fix some js errors

* optimize code

* try fix travis test not working as expected

* fix default config files

* fix config

assets/webconfig/js/content_leds.js

@@ -153,8 +153,8 @@ $(document).ready(function() {
 			schema: {
 				title:' ',
 				properties: {
-					generalOptions,
-					specificOptions,
+					generalOptions : generalOptions,
+					specificOptions : specificOptions,
 				}
 			}
 		});