`/app/views` gets appended to all template paths.  I actually like using "/foo" because it's more explicit.

That said, I only added support for this because of the already-existing logic [here](https://github.com/pokonski/public_activity/pull/120/files#L0L89) that prepends (what is now) `layout_root`.  I added support for this "absolute" form so that passing `:layout_root` wouldn't be necessary.