Add support for Xcode 5
[TargetInstaller] Set the architecture according to the value of the user targets
Merge branch 'master' into xcode-5-support

Conflicts:
	Gemfile.lock
	spec/cocoapods-integration-specs
[Analyzer] Do not warn about multiple `ARCHS` if there are none at all.
[Project] Make all Xcode 5 project validations green.
[Examples] Update to Xcode 5 default project settings to fix CI build.
[Examples] Set ONLY_ACTIVE_ARCH to NO for iOS builds
[CHANGELOG] Update for 0.25.0
Merge pull request #1352 from CocoaPods/xcode-5-support

Problems with 64-bit Builds and Xcode 5 GM