[SDKs] Remove ruby dependency from arv wrapper
In order to use the full set of CLI tools most users will use to interact with Arvados, you have to install both the Python and Ruby SDKs. This is poor UX: it's more dependencies to track down. This is exacerbated by the fact that Ruby isn't ubiquitous in the bioinformatician world; users who don't have Ruby installed already have to pull in a significant stack.
Please make the entire CLI suite available as one package. The easier it is to install across different flavors of Unix, the better.