Closes #346.

Like `pod spec lint https://github.com/tibr/Specs/raw/123277fe658059c6efd5801aee1e504f55d488f6/Kiwi/1.1.0/Kiwi.podspec --verbose'

Currently the setting is a top level attribute accessor,
in the future it should be supported for subspecs.

Closes #364.

* master:
  [Gemfile.lock] Update.
  Release 0.6.0.rc4
  [Rakefile] Improvements to release.

* master:
  Fix #324 - Setup should use `https://github.com/CocoaPods/Specs.git` url

Setup should use `https://github.com/CocoaPods/Specs.git` url

This is a better solution for the previous implementation as it allows
to ignore the deployment target if not specified in a pod.

See #358.

This reverts commit cfe61a69.

Conflicts:
	lib/cocoapods/command/spec.rb

See #358

This reverts commit aa3d7be4.

See #324.