Losslessly compress all images

Image is unchanged, but now loads way faster. I think I shaved about
80% off of the image size on average with https://imageoptim.com/ (can
also be integrated into grunt)
Merge pull request #2 from EdenSG/master

Losslessly compress all images
Merge branch 'master' of github.com:fightforthefuture/battleforthenet-widget