Merge pull request #1 from line-o/progressbar

Progressbar
Add polyfill to progressbar to overwrite browser styles
 Add html5-progressbar-polyfill
Modify progressbar with polyfill and 'Podlove' theme

- Define further variables for the progressbar
- Add polyfill to css for resetting browser specific styles for the <progress>-tag
- Add Podlove-theme to progressbar and its elements
- Delete unused <div class="meter"> from progressbar.js and its styles in progressbar.scss