File README.packaging of Package helm

Updating the vendor.tar.xz taball
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helm is using glide so you need a working glide binary.
Then updating the vendor.tar.xz tarball is done via:

$ cd $GOPATH
$ mkdir -p src/k8s.io
$ cd src/k8s.io
$ git clone https://github.com/helm/helm.git
# $VERSION is the version you want to package
git checkout $VERSION
$ cd helm
# make bootstrap will create the vendor/ directory
$ make bootstrap build
# now create the vendor tarball and use that in the package
$ tar cJf vendor.tar.xz vendor