Async Images, Swipable cover photos for mini sites

This works on stage right now, try it out if you want!

* Adds async image loading from the urls.
* Makes each MiniSite row similar to another app where you can scroll left and right to see photos. Right now you can't tap on them but soon you will be able to!
* Added some labels on top of the swipable view and a few text labels below with the name and location of the mini site.
* If you seed locally, you can see it work for the first mini site (under the first site).

Fix #211 
Fix #124 
Fix #72