Do not let normal users use Markdown
Add humanize_boolean for yes/no booleans
Implement humanize_boolean
Prompt for items in the description
Require a description
Better willing_to_pay_amount prompt
Better error message if image does not work
Set logo_url to nil accordingly
Add nilify_blanks Gem
Use nilify_blanks instead of special code
Ensure that a Game has a name
Merge branch 'master' into final