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

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

Return 1 when test_case is not supported in interop test

Registered calls

- adds signal handling to RpcServer
- ensures that very little behaviour occurs in the signal handling context
- adds #run_till_terminated that launches a server in a thread and then handles
  signals that can be used to stop it.

Updates gem dependencies, style rules

Correct storage classes of variables an functions

Removes nodejs pubsub example

Grpc ruby add interop cancellation tests

They don't need to be extern

Prevent symbol cache variables from being instantiated multipe times.

They do not need to be extern.