CSVSummaryReporter

Initial version of the CSVSummaryReporter. Should and will have a lot more output options, but the total time is what I want most at the moment.

Reviewer: @daithiocrualaoich 
Hm, we could just always set up a CSVReporter, but there's currently no interface for manipulating the configuration from within a reporter. I also like being explicit here so you don't have to wonder where that (possibly at some point massive) file came from in your workspace.