Fixing a few items with the new Bazel BUILD system:

-) Fixing Bazel 0.4.x breakage
-) Adding helloworld BUILD examples
-) Fixing grpc++ missing files.
-) Adding helloworld example as a test for Bazel basic.
diff --git a/bazel/BUILD b/bazel/BUILD
index 940a379..44a1673 100644
--- a/bazel/BUILD
+++ b/bazel/BUILD
@@ -2,8 +2,14 @@
 
 load(":cc_grpc_library.bzl", "cc_grpc_library")
 
+proto_library(
+    name = "well_known_protos_list",
+    srcs = ["@submodule_protobuf//:well_known_protos"],
+)
+
 cc_grpc_library(
     name = "well_known_protos",
-    srcs = "@submodule_protobuf//:well_known_protos",
+    srcs = "well_known_protos_list",
+    deps = [],
     proto_only = True,
 )