Enable fast cpp protos in the python interface.

Arena type traits standardization.

Fix narrowing implicit cast in generated message [NFC]

Fixes #1029

Use angle bracket for well known type proto header.

Use compiler provided static assert and avoid tripping unused-local-typedef warnings.

Fixes #1029

Added util/python/BUILD to provide //util/python:python_headers dependency for building use_fast_cpp_protos

Enable CLANG_WARN_NULLABLE_TO_NONNULL_CONVERSION for the projects.

This is adapted from the branch of @xfxyjwf at:

https://github.com/xfxyjwf/protobuf/commit/494716a682ef854168e92231a3cdcc89d587d9b9

and should solve the protobuf compilation problem against nvcc.

Tested against nvcc 6.5 and 7.0.

Making _genproto rules public.

Conformance test implementation for Python.

This enables other xx_proto_library targets to depend on xx_proto_library
targets in different packages, and specifically on xx_wkt_protos.

Add srcs_version = "PY2AND3" in BUILD files

The sources themselves appear to already be Python 3 clean.

Fix headers for gmock.BUILD

Tweak the error message as the generate is in the core binary these d…

Check and throw errors for nil values/keys (like NSDictionary).

Ensure the conformance build of objc code is using the Mac OS X SDK

JSON handling for Any

This required a rework of the tokenizer to allow for a "replaying" tokenizer, basically in case the @type value comes after the data itself. This rework is nice in some ways (all the pushback and object depth logic in one place) but is a little fragile in terms of token push-back when using the replay tokenizer. It'll be fine for the scenario we need it for, but we should be careful...

Add region tags for protocol buffers tutorials.

Since these tags might be confusing, added a note that these are not
part of the normal protocol buffers syntax.  I also linked to the main
tutorials page that uses these examples
https://developers.google.com/protocol-buffers/docs/tutorials so that
anyone who arrived here without going through that info first can get
more explanation if they want.

Bazel 0.1.2 fix strict header checks and sandboxing for C++
rules. This change add the necessary headers for gmock so
the headers get shipped in the sandbox.