Cannot specify maximum response time

It's possible to use piston-mini-client to make calls to a server that accepts connections but responds very, very slowly. Currently, piston-mini-client provides no way to specify an upper bound on remote calls; this is left up to the user. Handling these at an API caller level is tricky: you have to use threads or make the API calls in another process.

Instead, perhaps p-m-c should provide an option to specify a timeout, and raise an APIError if it hasn't received a complete response by the time that limit is hit.