Clarify some auth test definitions

Fix the flow control issue.

Grpc ruby add support for returning metadata to the rpc server 

Add SimpleCov coverage set up for gRPC ruby

Refactoring of core security to remove the factories.

- Renamed security_context -> security_connector.
- Credentials are now responsible for creating their own connectors.

Remove usage of xray

- xray was useful during dev testing but is neither a dev or runtime dep
- its presence causes issues for libraries that handle signals themselves

Also
- updates grpc.gemspec with requirements

resolve comments

Fixing dependency...

- allow BadStatus to contain metadata that's populated by keyword args
- on servers, convert raised BadStatus metadata to trailers
- on clients, convert trailers to BadStatus metadata when raising BadStatus

Avoid implicit function declarations

Use TypedData_XXX instead of Data_XXX

Adding option to add a null terminator when loading a file.

Move proto files up the tree to prepare for sharing.

Grpc ruby rpc server simple signal handling

Avoid generating libs for unknown types.

Conflicts:
	src/ruby/ext/grpc/rb_grpc.c

Conflicts:
	src/ruby/ext/grpc/rb_grpc.c

Wrap ParseCommandLineFlags in InitTest

Get GRPC_TRACE tcp working again

Get run_tests.py forever mode working again