Refactored the LightMonitor
Added a test for the LightMonitor
Merge pull request #1356 from gem/light-monitor

Light monitor
Merge branch 'master' of github.com:gem/oq-engine into hazard_curves_poissonian_new
Merge branch 'hazard_curves_poissonian_new' of github.com:gem/oq-engine into hazard_curves_poissonian_new
More monitoring