Work on #404, javadocs and test cases for DB and in memory dao.

dao/pom.xml

@@ -52,6 +52,10 @@
       <groupId>de.bechte.junit</groupId>
       <artifactId>junit-hierarchicalcontextrunner</artifactId>
     </dependency>
+    <dependency>
+        <groupId>org.mockito</groupId>
+        <artifactId>mockito-core</artifactId>
+    </dependency>
   </dependencies>
 
   <build>