Added flag --pod-versions to list command
Added tests for list --pod-versions
Added test for :name_and_version mode of UI.pod
Unset the `CDPATH` env variable before shelling-out. #1694
Merge branch 'master' of github.com:CocoaPods/CocoaPods
Test and documentation for issue #1694
Fix :head option for Pods from HTTP source.
Cleanup pod directory when download fails (probably due to a network error)

Fixes #1482
Merge branch 'master' of github.com:CocoaPods/CocoaPods into command-list-added-pod-versions
Always include version in list without flag.

As requested in original PR (#1617).

Also remove some extraneous whitespace that crept in.
Merge branch 'cleanup-pod-dir-on-failed-download' of https://github.com/alexrothenberg/CocoaPods into alexrothenberg-cleanup-pod-dir-on-failed-download
Fail with a helpful error if :head is unsupported.
Make test Ruby 1.8.7 compatible.

See https://travis-ci.org/CocoaPods/CocoaPods/jobs/21842661
Merge branch 'command-list-added-pod-versions' of https://github.com/z00b/CocoaPods into z00b-command-list-added-pod-versions
Test that helpful error message is actually displayed.
Add changelog entry for "Better linting for Github URIs." (CocoaPods/Core#77)
Only silence I18n deprecation warning if attr exists.

Fixes #1950.
[CHANGELOG] Update for #1950.
Merge branch 'master' of https://github.com/neonichu/CocoaPods into neonichu-master

Conflicts:
	CHANGELOG.md
Added changelog entry for pull #1960

Cleanup pod directory when download fails (probably due to a network error)