There seems to be a bug in node-gyp (nodejs/node-gyp#752) that prevents
it from working properly with other gyp files.

Node test coverage reporting

Updated end2end/README

Add scripts to build nuget package for zlib

Remove stdio usage from signal handler

Add more test cases to end2end test. 

Fix alarms

Fixes to bring code back into gcc4.4 compliance

Implement turnstile polling for Windows

Simplify running of cloud_to_cloud interop tests.

std::atomic

of ambiguous nullptr, eliminate use of brace initializer lists

Fix float to bool conversion compilation error in mac

Add some TODO comments for possible poll optimization

Pass through grpc_fd pointer rather than int.

ObjC - Adds class factory method to generated ProtoService classes

- single global mutex (simpler, easier to make correct for now)
- properly flag kick state for workers to avoid missing wakeups (if
signal is called before wait on the cv)