Port to Nuvola SDK

[jiri-janousek]

• https://github.com/tiliado/nuvolasdk
• https://groups.google.com/d/msg/nuvola-player-devel/NVsbGtIZf6A/x9MtIkSfDAAJ

• Author: Jiří Janoušek janousek.jiri@gmail.com
• Reviewed by: FIXME

---

When merging this branch, please follow Guidelines for Merge Commits, especially:

• Don't merge directly in GitHub as it produces a crappy commit message.
• The title of the pull request becomes the merge commit title (the first line of the merge commit).
• The description of the pull request up to the first horizontal separator/line becomes the merge commit body (separated from the title by a blank line).
• Fill in the Reviewed by line and add the Pull Request line.

[jiri-janousek]

Hello @kixam. I'm going to merge this pull request on Saturday, February 11th, unless you have any objections or tell me that you need more time to review the changes. If you agree with the proposed changes, but don't have time to merge them, let me know and I'll merge the branch by myself.