Fixed wrong image paths in stylesheet

[fschwahn]

After fixing the paths I realized that the images are not even displayed, but I was still annoyed by the error messages in the log file.

[runlevel5]

I do not prefer this hard-code path. Can you please cook a patch:

• Rename screen.css to screen.css.erb
• Use helper asset_path

Cheers

[fschwahn]

You are correct sir. I actually wondered myself, but just went with it. I updated the pull request.