Merge release-0_11 into master

Handle Cancel before start.

Add missing grace value to server stop in Python example.

Fix dead link in doc

Generate all file lists and build target lists in binding.gyp from build.yaml

Fix naming issue in stress_test

(via ahh@google.com)
Under some configurations gRPC includes google3 base headers.  google3
has a namespace "thread" which mixes poorly with unqualified use of the
type std::thread; adding that namespace to various google3 headers
breaks this test.

Improve grammar/language for clarity

Fixes #4122

Add a useful __str__ method to face exceptions

Small typo of NodeJS version in README.md

Fixed incorrect type in a malloc in Node extension

Corrects compile error on ruby 2.0

Fixing the doc to warn of the dangers for overriding the target name …

Grpc ruby fix flaky ruby interop test

Grpc ruby bidi call should read metadata

Remove unused RouteGuideClient and move RemoteTestClient to tests

ObjC: Update Sample

* Reference discussion: https://github.com/grpc/grpc/pull/4108#discussion-diff-44494393

- server logger.level = WARN
- client logger.level = INFO

- truncates the server debug log entries to make that readable

This fixes the current ruby server interop test flakiness.

- The interop tests recently changed so that clients access servers in
parallel, meaning that the interop servers handle multiple rpcs at once,
which is how this bug became visible

- since this change, tests run against the ruby interop server have
failed sporadically

- the problem was that the block in #loop_handle_server_calls that is
  passed to the thread pool referenced a var in an enclosing block,
  which resulted in requests being processed by the wrong handler

- this fix ensures that the block to be run on the thread pool thread
  does not have any references to vars in the enclosing block

Fixes an omission from earlier PRs that adds support metadata.

PHP: append application user agent string at the beginning