And lots of misc. work. Still failing: https://gist.github.com/9fffdffb35da111e6442

The installer should just instantiate the LocalPod class with the
platform, so that it only needs to query tha values it really needs from
the Specification.

Pod list new & RSS

[presenter] present output to per set so it doesn't wait for all the sets to be ready on lenghty operations

* origin/master:
  Small styling tweak.
  Add a --force-doc option and add `appledoc` install note to README.
  Make using `pod' from directories outside of the repo work.

[pod-list] introduced Pod::Command::Presenter::CocoaPod class that encapsulates pod presentation logic

[pod-list] pod list new now doesn't need to store the state in a file and displays the results in groups

- warning messages
- stronger validation
- validating pathnames starting with a slash
- cosmetics