Fixed variable height of player.

If an request is made with width and not height, the backend calculates
height on the basis of the aspect ratio of the file. So we allow to send
only width.
Merge pull request #26 from arjenk/fix/variable-height-player

Fixed variable height of player.
Allow full screen player to use 100% height.
Made owner identication in assets configurable.
Merge pull request #27 from arjenk/feature/owner-configurable

Made owner identication in assets configurable.
Merge pull request #28 from arjenk/fix/player-100-percent

Allow full screen player to use 100% height.
Made http links from backend use https.

This is a configuration on the mediamosa ck page.
Merge pull request #29 from arjenk/feature/https-switch

Made http links from backend use https.