Make gRPC C# nuget work with new project.json style projects

Remove Orphan C# files

Async void is illegal in ASP.NET and DNXcore

PHP: destroy grpc_byte_buffer after startBatch

ruby: Use fully-qualified type name when necessary

Binary logging

Upmerge from 0.13

Add a sanity check to make sure vsprojects stays usable.

Update http2 interop tests to work with Servers implementing HTTP Alt…

Handle google/protobuf includes in src/proto

Expand corpus, fix crash

Bumped version to 0.13.2-pre2

Created node tools package to distribute protoc and eventually the plugin

The new spec uses existing EchoDuplicate service in
grpc.testing.duplicate, which refers grpc.testing.Empty,
and verifies if the plugin generates this correctly as
Grpc::Testing::Empty.

Check dependencies between filegroups

Allow specifying fuzzer runtime

Fix census plugin initialization for census filters.

Since filegroups are now correctly layered, build systems that needed these libs can now instantiate the filegroups as libs directly.