Yay compatibility and predictability!

Pending:

- Tag BoringSSL repo.
- Tag gRPC repo.
- Build the plugin, zip it, and add it to the release.
- Push Cocoapods to trunk.

Don't always import Protobuf like a framework

Move Python.h include out of loader code

PHP: fix interop tests breakage

Document rpc details as string type

Improved some Ruby inline documentation

To make a certain private code base work in a certain way nicer than the
current way.

php: prepare for GA release

Fix missing source file

Restructure reStructured text to be valid

If the macro isn't set, e.g. for Bazel compilations, import the way it was done before https://github.com/grpc/grpc/commit/fb4a54541a6e00c43e1671cda0a25e2eda4792df.

Remove unnecessary "Failed parsing HTTP2" detail

Distribute ProtoC and the plugin as pods

Add special methods to generated Python docs

This should make Travis only test the last commit of every PR.

Use test roots.pem in test - cherry-picking for v1.0.x

Upmerge 0.15 -> 1.0

Removed early adopter code

Also removes an old-now-spurious `make` invocation from the docgen.py
helper script.

Conflicts:
	.gitmodules
	gRPC.podspec

gRPC.podspec shouldn't be a template anymore.

Added Glossary to docs with metadata definition