Feature/project wall refactor

This builds on https://github.com/onepercentclub/bluebottle/pull/1205

- Remove projectIndex route/controller
- Move wallpostList  into a component
- Move all logic to load (more) wallposts into that component

I could indent the ((bb- and {{render, other then that it seems fine in the end result.
I split the component over two lines for readability, do you think that's ok?