* add favicon for site
* opponent and button columns default to an invalid choice
Merge pull request #196 from cgolubi1/177_favicon

add favicon for site
Merge pull request #197 from cgolubi1/184_selectopponent

opponent and button columns default to an invalid choice
* standardize action log format for reporting about attacks, and provide much more information after an attack
Merge branch 'master' of github.com:buttonmen-dev/buttonmen into 79_summarize