Use Eclipse/Sisu 0.0.0.M2 milestone

See https://jira.codehaus.org/browse/MNG-5453

The major differences between the new Eclipse/Sisu artifacts and the old bundles are:

* brand new Plexus configurator code
* no shading/jarjar of any dependencies

From a Plexus API perspective the artifacts are "drop-in" compatible. Local testing has not revealed any issues with the new Plexus configurators, but as this code was developed indirectly from the behaviour of the old configurators further real-world testing may reveal differences that could either be beneficial or unwanted...

PS. Any Eclipse/Sisu issues can be logged at https://bugs.eclipse.org/bugs/enter_bug.cgi?product=Sisu&format=guided or discussed at https://dev.eclipse.org/mailman/listinfo/sisu-users