Merge pull request #3175 from jcanizales/test-swift

src/objective-c/examples/RemoteTestClient/RemoteTest.podspec

src/objective-c/examples/RemoteTestClient/empty.proto

src/objective-c/examples/RemoteTestClient/messages.proto

src/objective-c/examples/RemoteTestClient/test.proto

src/objective-c/examples/SwiftSample/AppDelegate.swift

...jective-c/examples/SwiftSample/Base.lproj/Main.storyboard

src/objective-c/examples/SwiftSample/Bridging-Header.h

...ftSample/Images.xcassets/AppIcon.appiconset/Contents.json

src/objective-c/examples/SwiftSample/Info.plist

src/objective-c/examples/SwiftSample/Podfile

...xamples/SwiftSample/SwiftSample.xcodeproj/project.pbxproj

...le.xcodeproj/project.xcworkspace/contents.xcworkspacedata

src/objective-c/examples/SwiftSample/ViewController.swift