[#73271162] add logo images
[#73271162] add logo backgorund
[#73271162] Merge remote-tracking branch 'origin/master' into 73271162-style-logos
[#73271162] add CSS for displaying iamges
[#73271162] add file for svg & png download
[#73271162] fix colors.html so it's more responsive
[#73271162] add apple touch icon
[#73271162] udpate Grunt build gengo.css
[#73271162] fix circle logo position
[#73271162] Merge remote-tracking branch 'origin/master' into 73271162-style-logos
Merge pull request #39 from gengo/73271162-style-logos

[#73271162] Style logos