Some theme css files are empty in 5.1.1 release

[ManuelHaas]

Hi,

when loading smartwizard via npm the css files for dot and progress theme are empty. Even so in the zip file with the provided source on github.

[techlab]

Fixed the issue on v6. Please see https://github.com/techlab/jquery-smartwizard/releases/tag/v6.0.1
Thank you @ManuelHaas