Feature suppress repeated successes

[ChrisBellew]

This is my first time using git so please let me know if I am doing anything wrong :) (i'll try not to screw the whitespace next time)

Firstly, love this reporter. However, it's sometimes annoying to get spammed when tests keep succeeding. I use KarmaVS and press save a lot so the tests run very frequently (every minute). I only really want to know if the tests have been passing and then I suddenly break them, or if they are repeatedly failing.

Therefore I thought it would be nice to add the ability to suppress repeated successes if the previous run was also successful. Then it will only spam if you broke something. It defaults to not suppressing.

[vojtajina]

THanks @ChrisBellew I think this is a nice feature!!!

Can you look into my comments and then squash everything into a single commit with commit msg following the convention, something like feat: allow suppressing repeated success.

Also, can you please sign the Google CLA please?

Thanks a lot.