Merge pull request #50 from alanjcfs/choose-and-animate-avatar

Choose and animate avatar
allow people to hold down the button to move. fixes #17
Merge pull request #51 from yesugei/master

allow people to hold down the button to move. fixes #17
Use library/fs module to traverse avatar assets

Some people don't necessarily have lfs installed. We use the included
library to traverse through the files and set the image.