Make hyphen in version optional

Support packages with simple versions like `1`.
Add some [noop] messages

Indicate when __create_build_dir and __fetch_tarball don't do anything.
Rename directory out of tarball

Ensures that it matches debuild's expectation of `name-version`. Deletes any
existing copies before extracting/renaming.

Previously the DSC was referencing a codebase that only contained our
`debian/` directory because the tarball contained a different name.

This probably won't handle tarballs that don't contain a parent directory. I
expect that something bad will happen. We'll tackle that when it arises.
Take directory instead of name as argument

Makes it easy to auto-complete on the CLI. Does away with the need for
`self.name`. The build directory has been renamed to match `name-version`,
per `expanded_dir`, because it's easier to construct this from the details
in the changelog. This will also prevent conflicts where we have multiple
versions of package sources in our Git repo (eg. `ruby1.9.2` actually
creates a package called `ruby`).