Fixed #103 - The IT addSource does not define the plugin

 - The version etc. are not correctly defined in the test project.
   That means this test will test a release version of the plugin
   and not that one which should be tested with this IT.

src/it/addResource/pom.xml

@@ -12,8 +12,9 @@
     <defaultGoal>package</defaultGoal>
     <plugins>
       <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>build-helper-maven-plugin</artifactId>        
+        <groupId>@project.groupId@</groupId>
+        <artifactId>@project.artifactId@</artifactId>
+        <version>@project.version@</version>
         <executions>
           <execution>
             <id>add-resource</id>