group persistence modules (#2890)

* move security content from spring-security-rest-full

* swagger update

* move query language to new module

* rename spring-security-rest-full to spring-rest-full

* group persistence modules

persistence-modules/redis/src/main/java/com/baeldung/LedgerServiceInterface.java

@@ -0,0 +1,10 @@
+package com.baeldung;
+
+import java.util.List;
+
+/**
+ * Created by johnson on 3/9/17.
+ */
+public interface LedgerServiceInterface {
+    List<String> getEntries(int count);
+}