jclouds Development Tools

This dir would be made up of sub-dirs that hold scripts and config that help us develop jclouds.

No release artifacts would be created from this dir or stored in this dir.
@everett-toews Thx for doing this!  

Here is my take on the problem at hand:
In the top-level tools directory, each "tool" should have its own top level directory like so:
`/tools/blobstore-cli`
`/tools/blobstore-bench`

Each tool would be like any other project and should have its own build to generate it's artifacts. That said, we should probably have a new Maven group id of `org.apache.jclouds.tools` with proper artifact ids. I assume that most of these tools will run on the JVM.

The potential is there to make the build smart enough to handle the install/config. On the other hand, we could provide built artifacts that users can download directly from the site. I don't imagine these tools would change very often.

/cc @andrewgaul