Update console.go to work across browsers

The KeyboardEvent.keyIdentifier property doesn't work in some browsers (such as Firefox). This commit implements a more cross-browser handling of key presses. 

Sometime in the future KeyboardEvent.key should work and be more clear, but not supported well yet:
https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent.key
Merge pull request #73 from JKillian/patch-1

Update console.go to handle keyboard input from browsers that do not support keyIdentifier.