- cors configuration via hapi properties based on change request 6858c0d799 (r266027967)

- reverted mysql as default and used derby based on change request 6858c0d799 (r266028296) and updated readme to include specifics on configuring mysql
- defaulted to jetty configs on hapi.properties so that this starter app will outright work without changing any configs with mvn jetty:run
- updated subscription configs as it doesn't match already active subscription on subsequent runs using mysql as db
- updated project based path resolution and removed unused file .keep_hapi-fhir-jpaserver-starter

src/main/java/ca/uhn/fhir/jpa/starter/HapiProperties.java

@@ -41,6 +41,8 @@ public class HapiProperties {
     static final String SUBSCRIPTION_WEBSOCKET_ENABLED = "subscription.websocket.enabled";
     static final String TEST_PORT = "test.port";
     static final String TESTER_CONFIG_REFUSE_TO_FETCH_THIRD_PARTY_URLS = "tester.config.refuse_to_fetch_third_party_urls";
+    static final String CORS_ENABLED = "cors.enabled";
+    static final String CORS_ALLOWED_ORIGIN = "cors.allowed_origin";
 
     private static Properties properties;
 
@@ -255,6 +257,14 @@ public class HapiProperties {
         return HapiProperties.getBooleanProperty(TESTER_CONFIG_REFUSE_TO_FETCH_THIRD_PARTY_URLS, false);
     }
 
+    public static Boolean getCorsEnabled() {
+        return HapiProperties.getBooleanProperty(CORS_ENABLED, true);
+    }
+
+    public static String getCorsAllowedOrigin() {
+        return HapiProperties.getProperty(CORS_ALLOWED_ORIGIN, "*");
+    }
+
     public static String getServerBase() {
         return HapiProperties.getProperty(SERVER_BASE, "/fhir");
     }