Update LICENSE text to 2015, implement a checker that validates
whether a 2014 or 2015 version of the license is on each {.c,.cc,.h} file.
Fix the ones that are missing it.

Documentation tweaks in grpc.h.

Properly msan-instrumenting protobuf and our C++ tests

Cleaning up our posix definition / usage.

Fix time header file for Mac

Renaming the docker image to grpc_clang, and optimizing the build a bit.

-) Let's not use _POSIX_SOURCE. It usually implies too much C99. _BSD_SOURCE would be the right thing to do here.
-) _BSD_SOURCE is getting deprecated by glibc, so we also have to define _DEFAULT_SOURCE under Linux.
-) accept4 and eventfd arn't as old as we may think; let's detect for it.
-) stdint.h interferes with all these definitions if included too early; let's move it down.

Change the interface of RPC Framework's Future interface.

Switching the fling benchmarks to the new API. 

Now our Future interface is as-API-compatible-as-possible with
Python's own concurrent.futures.Future.

Setting default ssh directory in the case of test runs running as root.

C# refactoring of GrpcEnvironment and PortPicker

added license headers to all grpc C# files

Docker

Rename examples/tips to examples/pubsub

Add ubsan support

Adding a Dockerfile script that can build a docker image with an msan-compatible C++ compiler.

Fixing java_base to edit permission on a key file