MGWT-364 - gwt-maven-plugin\src\it\reactor RPC 404 exception when clicking at the "Click me" button

Fixes http://jira.codehaus.org/browse/MGWT-364

Patch in action:
![2013-08-30_00h30_00](https://f.cloud.github.com/assets/1857095/1054022/4bdf43a0-10fb-11e3-8e46-96a7d67118a8.png)