Support most URL variants that flickr provide. Improve user id detection and introduce the very first tests.

Fix YAML syntax.

Fix Issue #2886027: Username is encoded twice in theming function ; Thanks mduvergey for reporting.

First release candidate of this module for Drupal 8.

Changes since -alpha4 include:

New major version of Media Upload.

- Extracted the upload screen out of the administration.
This modification allows you to grant access to the media upload screen to any user without having to grant them administration access.

- Several bufixes
- Code cleaning

The issue that a second payment appears after cancelling the payment is fixed, but it required us to clean up the architecture a little bit. This requires a database upgrade, it should contain sufficient comments inline of what is actually happening but please read the changes first before applying them to a production site.

This also makes us compatible with commerce rc1.

Changes since 8.x-1.0-alpha2: