[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

Other minor changes

- Change in documentation name from "name (0.0.1)" to
  "name 0.0.1" to adhere to Apple's practice.
- Appledoc doesn't print the settings anymore with verbose
  install to tame it's output.

This fixes the generation of ASIHTTPRequest docs, which always made
building of the MacRubySample block.

* 'master' of github.com:CocoaPods/CocoaPods:
  Don't print an error report when someone sends an interrupt signal.
  Add correct encoding comment to error_report.rb.

The command can picked a commit that was in a
branch and presented an overestimated number of new pods
as the branch may include the pods added to master
during its life time

The issues is recognizable by the following pattern
`$pod list 2' => shows 20 new pods
`$pod list 3' => shows a correct low number of new pods

I really love the online editing capability of GitHub, though!

Fixes https://github.com/CocoaPods/Specs/pull/84#commits-pushed-45cb459.

Colors