Implement a sonar processor

Hi, 

We've implemented a way for sputnik to run Sonar-runner to report issues.
We use it in conjunction with sonar-ndepend (https://github.com/criteo/sonar-ndepend) but should work with
all sonar plugins as long as they provides the line information.

Cheers
From here (http://svn.codehaus.org/sonar/trunk/sonar-plugin-api/src/main/java/org/sonar/api/rules/RulePriority.java) this is the correct order.