comments, tests and description

converter/pom.xml

@@ -14,6 +14,10 @@
             <artifactId>junit</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+        </dependency>
     </dependencies>
     <artifactId>converter</artifactId>