* WORKSPACE and BUILD for bazel support

* added google/protobuf BUILD file and protos

* more cleanup

* added bazel support to readme

* removed local copy of .bzl files

Using the grpc's bzl files
Cleaned up WORKSPACE
Formated BUILD files

* removed local copy of google/protobuf

Modified grpc skylark files to use protobuf submodule's
copies of the well known protos.