Merge github.com:grpc/grpc into bye-bye-completion-queue-pie

Makefile

build.json

include/grpc++/async_unary_call.h

include/grpc++/impl/call.h

src/compiler/cpp_generator.cc

src/ruby/bin/math_server.rb

src/ruby/lib/grpc/core/time_consts.rb

src/ruby/lib/grpc/generic/rpc_server.rb

test/cpp/end2end/async_end2end_test.cc

test/cpp/end2end/end2end_test.cc

test/cpp/end2end/mock_test.cc

test/cpp/end2end/thread_stress_test.cc

test/cpp/qps/client_async.cc

tools/profile_analyzer/profile_analyzer.py

tools/run_tests/tests.json