Improve the UI
Improve the UI

This commit changes 2 things:

1) cleaner user interface
2) add 'retry' option even when the provided submission was correct

igrigorik/vimgolf,igrigorik/vimgolf,urticadioica/vimgolf,urticadioica/vimgolf,urticadioica/vimgolf,igrigorik/vimgolf,igrigorik/vimgolf