Initial move of the demos app.
Refactor/rewrite imports, URL reverses and settings due to move of demos app.
Merge pull request #2564 from ubernostrum/move-demos-app

Move demos app
Move feeder app.
Move humans app.
Merge pull request #2573 from ubernostrum/move-humans

Move humans app.
Merge pull request #2572 from ubernostrum/move-feeder-app

Move feeder app.