Merge pull request #127 from silversteez/master

Added warning to landing page
Fixed timestamp format for logs
Fixed indentation on guestNames
Merge pull request #128 from mrngoitall/master

Fixing timestamps in the log file
Update README.md
Adding small screenshot image
Merge branch 'master' of https://github.com/cardsforhumanity/cardsforhumanity
Specifying an image for facebook post thumbnails