[Linter] Fixes an issue linting invalid HTTP sources

Fixes https://github.com/CocoaPods/CocoaPods/issues/2463
Release 0.34.0.rc2
[Linter] Drop policy for 0.0.1 versions
Merge pull request #171 from CocoaPods/fabio/remove-0.0.1

[Linter] Drop policy for 0.0.1 versions
Fix typo in linter warning message
Merge pull request #172 from dlackty/patch-1

Fix typo in linter warning message
[Source] Add the notion of a source URL
[RuboCop] Prefer $CHILD_STATUS from the English library over $?.
[FileSystemDataProvider] chomp the url
[RuboCop] Update .rubocop_cocoapods.yml
[Documentation] Update documentation for Podfile#source to reflect the fact that the parameter is now a URL string
[GitHubDataProvider] Remove the GitHub Data Provider, as it is unused

See https://github.com/CocoaPods/Core/pull/174 for the discussion.
[Changelog] Add entry for Source#url
Merge pull request #174 from CocoaPods/source-url

Give Sources and SourceProviders a url attribute
[bundle] update
[CHANGELOG] Prepare for 0.34.0
Bump to 0.34.0
[bundle] update
[Documentation] Use a real-life specs repo as the example
[Documentation] Match param name to method parameter