Merge pull request grpc#303 from grpc/podspec-0.6.0

Cut a 0.6.0 release due to the breaking changes in SwiftProtobuf 1.1

Merge pull request grpc#295 from rebello95/fix-strict-prototypes

Fix -Wstrict-prototypes warning

Update podspec to version 0.5.0.

Update podspec to 0.4.3.

Merge pull request grpc#213 from grpc/podspec-validation

Fix a few problems found running "pod spec lint".

Merge pull request grpc#201 from MrMage/wait-timeout

Add a `timeout` option to blocking `send()` and `receive()` calls

Merge pull request grpc#203 from rebello95/channel-sharing-tests

Add ServiceClient tests for shared channels

Update Examples for 0.3.3

Remove unneeded CountDownLatch class.

Import file naming code from swift-protobuf to allow consistent file …

…naming between the grpc and protobuf plugins.

First steps.