Update "known good" ruby versions in README
README: Use ``` notation for code snippets
Add .DS_Store (a Mac OX X dropping) to .gitignore
README recomments setting server.interface '127.0.0.1'

Resolves #4
Add RSpec example using Ftpd in specs
Add the Fetcher::FTPFetcher client to spec example
Add documentation to spec
Configure RSpec for documentation output with colour
Add clarification to the second example spec
Move example_spec into its own folder
Fix paths due to file being moved
example_spec: Vertical whitespace consistent with ftpd
example_spec: Do not force rspec format (let the user do it in the .rspec file)
example_spec: Add ftpd to load path
example_spec: Move Driver inside spec.  Driver creates temp dir.
example_spec: The code under test no longer creates a directory
example_spec: Make test silent
example_spec: Add comment that FTPFetcher is the code under test
example_spec: More obvious values for user and password
example_spec: use 127.0.0.1 rather than lvh.me, since no subdomains are in play