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/BUILD b/BUILD
index 3122dc0..2c9a6f3 100644
--- a/BUILD
+++ b/BUILD
@@ -1078,6 +1078,7 @@
         "src/cpp/common/completion_queue_cc.cc",
         "src/cpp/common/core_codegen.cc",
         "src/cpp/common/rpc_method.cc",
+        "src/cpp/common/version_cc.cc",
         "src/cpp/server/async_generic_service.cc",
         "src/cpp/server/create_default_thread_pool.cc",
         "src/cpp/server/dynamic_thread_pool.cc",
@@ -1086,6 +1087,7 @@
         "src/cpp/server/server_context.cc",
         "src/cpp/server/server_credentials.cc",
         "src/cpp/server/server_posix.cc",
+        "src/cpp/thread_manager/thread_manager.cc",
         "src/cpp/util/byte_buffer_cc.cc",
         "src/cpp/util/slice_cc.cc",
         "src/cpp/util/status.cc",