Return match quality result from match()

[mirodietiker]

The match() method just returns matches above the threshold.

Sometimes the thresholds are not that hard. There might be a safe threshold to run something with strict assignment and some lower threshold where matches are not considered to be sharp and possibly need review. Still, we want to continue process.

To allow this kind of stuff, the match should return some result with data about match quality, in addition to the contacts.

[edurenye]

I created the pull request for it #30