We need to depend on its API for fuphttp, so it's better if it's a separate
package to avoid embedding things we don't need.
In general it's probably a good idea to separate the logic from the embedded
content...
This allows setting the persistent storage location to save files into.
NOTE: defaults to mem:// for development purposes, which... is gonna be a bad
time.
This extracts the hash-named static assets into a directory. This is primarily
useful if you have multiple instances of fup running and you therefore need to
serve /static from a shared filesystem of some sort.
