Use .ToLowerInvariant, which is supported by coreclr

Fix python distribtest on fedora20 and fedora21.

Revert "Add an implementation firewall against pollset_set"

Add an implementation firewall against pollset_set

Fix PHP pecl install problem on Mac

Have a dedicated server security connector.

Made Alarm's constructor a template for deadline

Change pollset_work signature to allow moving grpc_pollset_worker to implementation

global replace health check proto v1alpha to v1

Fix SimultaneousReadWritesDone test

streaming API. In particular, Finish should not be called until the client
is sure that there is no more message to be read (as documented in
the comments for ClientStreamingInterface::Finish)

Expand gtest suites into individual run_tests tests

Support coreclr platform detection

Upmerge from 0.13

Fix PHP pecl package build on Mac

Updated travis to use Xcode 7.2 and SDK 9.2

clang-format all the things.

Fixing format and copyright.