Added dependencies and instructions to spawn 4 servers for development purposes. Currently the servers have to be spawned manually every time they are required, but #10 has some thoughts about how to automate this in the future.
Contributes to #4. Adding a Tahoe-LAFS instance to enable testing of saving data to a descentralized file system.
.gitgnore
Fixes #6. The content of the original `.gitgnore` file seems wrong.
