Change XPath query to SonarLibrary API

Hello,

I've changed many of the based code to access data.
My code is now working with the lastest Sonar version (4.4 and 4.5) because it use the sonar library API.
org.codehaus.sonar:sonar-ws-client

- Change XPath query with XML format to SonarLibrary API
- Add Builder methodes to create Pojo Objects for Metrics, Project, Measures, Rule ...

Is it possible to merge this to master branch ?

Grégory