Trying to enable Jacoco integration test covering on pax-exam web

Hi,

Here's a first try to make integration tests coverage working with Jacoco.

I made some maven changes (surefire, failsafe and jacoco plugin declaration, plus the addition of the sonatype snapshot repo to add the jacoco 0.6.5-SNAPSHOT version of the plugin due to a blocker issue), but I'm not sure it works because I'm not able to build it with all tests passing.
As an addition, it seems that jenkins karaf exam tests are failing due to a wrong interpretation of the exam vmArg command, so can you check this with your Ci server before accepting changes?

Thanks in advance and Regards 

Charlie