use jax rs instead of wicket for rest api

src/main/java/com/commafeed/frontend/rest/RESTApplication.java

@@ -0,0 +1,22 @@
+package com.commafeed.frontend.rest;
+
+import java.util.Set;
+
+import javax.ws.rs.ApplicationPath;
+import javax.ws.rs.core.Application;
+
+import com.google.common.collect.Sets;
+
+@ApplicationPath("/rest")
+public class RESTApplication extends Application {
+
+	@Override
+	public Set<Class<?>> getClasses() {
+		Set<Class<?>> set = Sets.newHashSet();
+		set.add(JSONMessageBodyWriter.class);
+		
+		set.add(SubscriptionsREST.class);
+		set.add(EntriesREST.class);
+		return set;
+	}
+}