Make protobuf Skylark extension appends the workspace root
Make protobuf Skylark extension appends the workspace root

This change make protobuf skylark extension works when using
remote repository.

Note that this make the Skylark extension unusable prior
to Bazel 0.1.4 because the workspace_root is not available
on prior version.

Tested with Bazel 0.1.4rc2.

Fixes https://github.com/bazelbuild/bazel/issues/784.

google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,Livefyre/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,Livefyre/protobuf,google/protobuf,google/protobuf,google/protobuf