- Changed "url(@pdfjsImagePath/*.*)" to "url('@{pdfjsImagePath}/*.*')"
- Changed CSS class 'pdfjs 0%' to 'pdf0'
- Changed CSS class 'pdfjs 100%' to 'pdf100'
- Added '/.idea' to .gitignore for PHPStorm project.

usages for setting the var:
- lessc command:
   lessc viewer.less viewer.css --global-var="pdfjsImagePath=path/to/images"

- gulpfile (for example laravel elixir):
    globalVars: {
        pdfjsImagePath: "'path/to/images'"
    }