* master:
  Update README.md
  Release 0.16.1
  [Gemspec] Bump Xcodeproj to 0.4.1
  [CHANGELOG] Update for Xcodeproj 0.4.1 and CocoaPods 0.16.1
  Update bundle and make specs green.
  [Update Command] Remove duplicate option in help. Closes #725.
  Update previous patch to match code-style.
  Unpack tgz files into pod's root #727
  If a repo isn't passed to push default to master

Conflicts:
	CHANGELOG.md
	Gemfile.lock
	cocoapods.gemspec
	lib/cocoapods.rb
	lib/cocoapods/command/push.rb
	lib/cocoapods/command/update.rb
	lib/cocoapods/downloader/http.rb
	spec/functional/downloader_spec.rb
	spec/unit/http_spec.rb

Small README.md update

Fix twitter links to @CocoaPods account in description and Collaborate sections

E.g. Use Pathname API.

Zip files are usually packaged with their contents in the archive file's root.
Tgz files are usually packaged with only a folder in the root.
Make them both behave the same by moving that single folder's contents up.
This is basically the opposite of what Finder does (which creates a folder for the zip file's
contents, so you always unarchive into a folder).

Pod push default repo

- Needs a new name :-)
- Closes #695

With this patch the Main group of the Pods project is also sorted.

Closes #647
Closes #588

This includes a fix for an issue which caused the use of the incorrect
specification for dependencies from external sources.

Closes #548.

- added support for manifest.lock.
- added support for checking specifications checksums.
- removed lazy repo update as the check for the specifications checksums
  requires an up to date repo.

Closes #604.