Export function gpr_log_severity_string for grpc_csharp_ext

PHP: Fixed bug in protoc plugin escaping comments

More Doxygen comment improvements.

Replace %zu format specifiers for mingw/ruby build

Specify mingw for c++ in ruby windows artifacts

C++ Documentation Audit Fixes 

PHP: windows config.w32 file

C# qps worker improvements

Fix Sanity

Use deps rather than uses.

Undo downgrade of Protobuf submodule

Remove unnecessary require_relative in Ruby gem

Change round_robin LB policy to use the addresses in the order given.

Update PROTOCOL-WEB.md

Features included in this merge:
- Added script to build and upload docker image for matrix test.
- Added script to create test cases and created go__master testcases based on it.
- Created dictionary for runtimes and gRPC releases for supported languages.
- Added go 1.7 and 1.8 Dockerfile/templates.

See tools/interop_matrix/README.md for details.

Dont concatenate strings when status is OK

Added a binary trailer test

Features included in this merge:
- Added script to build and upload docker image for matrix test.
- Added script to create test cases and created go__master testcases based on it.
- Created dictionary for runtimes and gRPC releases for supported languages.
- Added go 1.7 and 1.8 Dockerfile/templates.

See tools/interop_matrix/README.md for details.

Allow specifying DNS server to query for c-ares via URI authority.

Clarify the content type requirement (for message formats).

Add trace protector to flag

Set Frame Size to Bytes per Microsecond