Use Guice to Instantiate Supplemental Routes (#54)

* Use Guice to Instantiate Supplemental Routes

* Update Main.java

Author: vjkoskela

src/main/java/com/arpnetworking/metrics/mad/Main.java

@@ -220,15 +220,7 @@ private void launchActors(final Injector injector) {
         // Load supplemental routes
         final List<SupplementalRoutes> supplementalHttpRoutes = new ArrayList<>();
         _configuration.getSupplementalHttpRoutesClass().ifPresent(clazz -> {
-                try {
-                    supplementalHttpRoutes.add(clazz.newInstance());
-                } catch (final InstantiationException | IllegalAccessException e) {
-                    LOGGER.warn()
-                            .setMessage("Failed to instantiate supplemental http routes")
-                            .addData("supplementalHttpRoutesClass", clazz)
-                            .setThrowable(e)
-                            .log();
-                }
+                supplementalHttpRoutes.add(injector.getInstance(clazz));
         });
 
         // Create and bind Http server