reorganize into separate crates

- taskchampion -- core implementation of a replica
 - taskchampion-cli -- command-line interface
 - taskchampion-sync-server -- server implementation (not much yet!)

src/lib.rs

@@ -1,22 +0,0 @@
-// TODO: remove this eventually when there's an API
-#![allow(dead_code)]
-#![allow(unused_variables)]
-
-#[macro_use]
-extern crate failure;
-
-mod errors;
-mod operation;
-mod replica;
-mod server;
-mod task;
-mod taskdb;
-pub mod taskstorage;
-
-pub use operation::Operation;
-pub use replica::Replica;
-pub use server::Server;
-pub use task::Priority;
-pub use task::Status;
-pub use task::Task;
-pub use taskdb::DB;