Publish the release artifacts to the staging directory

After the artifacts are generated and signed, you can run the following script under the folder tools, to upload them into the staging directory:

$ ./upload_artifacts.sh <WORK_DIR>

The <WORK_DIR> should be the same one used to download the source code. This script will create a remote directory named openwhisk-<major>-<minor> under the staging directory, and push all the files available locally under openwhisk-<major>-<minor> upstream. It will overwrite the old files or directories, if the directory openwhisk-<major>-<minor> is available as a svn folder.