Include Wikimedia Commons as image source

[slaporte]

Wikimedia Commons has some beautiful, high-res Featured Pictures and a picture of the day. It would be cool if that was included as an easy image source.

[Hurtak]

Good idea, I have put it in todos section in main README.md.
This will probably not be trivial change (not so big either) because

1. We need to add some image provider abstraction so we do not have copy pasted code for bing, wiki, etc.
2. I noticed that some pictures of the day are in vertical mode, so this could cause problem displaying tall images as we currently use cover image crop/display method. Maybe we could thought about some other layout, like image on the left, image description on the right, but this would need to work with existing widgets.