Fixing comma in filename

This fixes issue #168

Improving zen mode

Updating setup file

Adding a imageio-ffmpeg dependency

Updating version

Cleaning the output

Updating version number

Updating readme

Improvements of initial backend handling

This improved how the installed backnends are checked and makes sure that only installed backends are reconded into config.
This addresses the issue #23 and generally improved the code.

Implementing transition option for swww

This addresses issue #20