Store computations via server

Given appropriate access a server should support the remote creation of local datasets. A remote user of a local server should be able to perform a computation and then store the results of that computation locally on the machine that hosts the server.

Alice sets up server
Bob connects to Alice's server
Bob performs computation on Alice's machine
Bob stores result on Alice's machine

Some questions:
- Should access be given only within the directory where the server was run?
- How do we handle target storage format? Perhaps we need to send sufficient arguments to `into` that would completely specify the target. How do we send types like `DataFrame`?

cc @hhuuggoo