Bump to logback 1.1.0.
Removal of the hack, and programmatically install JUL level change listener.

To not have to much with existing logback XML configurations, but
have it "working out of the box".
Reshuffled installation location.

Made it happen early, before Joran sets
levels, to grab all the context events.
Merge pull request #324 from sonatype/update-logback

Bump to logback 1.1.0.