Add openssh to the README

Closes #11
Don't redo the DB if it already exists.

Fixes #8
Make stowing reentrant on Windows

Excluding the entire configs/ directory meant that stow failed when
reprovisioning.

Instead, we only exclude the nginx directory, and then we use --include
to enable continued rsyncing of the configs in the stow directory
Don't fail on creating directories.

If mkdir fails, it's probably because the directory is already here.
Clean up ecoservice provisioning

 - Don't download Go again if it is already there
 - Use godep for dependencies
 - Use the project's Makefile
Use a simple cp for configs instead of stow

Fixes most of the issues around nginx and symlinks

Configuration changes will now require reprovisioning.
Stop services if they are running at the start of provisioning
Don't fail when setting up nginx sites if it's already done