Add mp3 download link to episode on single page
Append download links of all files
Add smart separator line between download links
Add audio player
Distinguish between audio and video files.

Firstly, only audio files are included and an HTML5 audio player is includes. Secondly, all video files are fetched to include an HTML5 video player.
Make audio / video player 100% width
Merge branch 'develop' into feature/link_files_frontend

* develop:
  Add line break after gitter icon
  Added Gitter badge
Add View for Single Page
Single Page Controller passes a model to the view.
Add Dropdown function
Append one dropdown with all media files to end of content
Add javascript and non-js alternative
Add first media link to a-tag

If the select did not change no link was set and a click on download didn't do anything. Now the first medialink is set to the a-tag to match the dropdown menu
Add player and download links: Closes #14