Initial beacon node setup.

- Add network crate.
- Add sync crate.
- Add version crate.
- Add lighthouse configuration.
- Add network configuration.

beacon_node/sync/src/lib.rs

@@ -0,0 +1,68 @@
+// /// Syncing for lighthouse.
+
+/*
+// for initial testing and setup, to be replaced.
+pub fn sync_server(config: Config) {
+    // Set up database
+    let db = match config.db_type {
+        _ => Arc::new(MemoryDB::open()),
+        //TODO: Box db
+        //DBType::Memory => Arc::new(Box::new(MemoryDB::open())),
+        //DBType::RocksDB => Arc::new(Box::new(DiskDB::open(&config.db_name, None))),
+    };
+
+    // build block
+    let block_store = Arc::new(BeaconBlockStore::new(db.clone()));
+    let state_store = Arc::new(BeaconStateStore::new(db.clone()));
+
+    // Slot clock
+    let genesis_time = 1_549_935_547; // 12th Feb 2018 (arbitrary value in the past).
+    let slot_clock = SystemTimeSlotClock::new(genesis_time, spec.slot_duration)
+        .expect("Unable to load SystemTimeSlotClock");
+    // Choose the fork choice
+    let fork_choice = BitwiseLMDGhost::new(block_store.clone(), state_store.clone());
+
+    /*
+     * Generate some random data to start a chain with.
+     *
+     * This is will need to be replace for production usage.
+     */
+let latest_eth1_data = Eth1Data {
+deposit_root: Hash256::zero(),
+block_hash: Hash256::zero(),
+};
+let keypairs: Vec<Keypair> = (0..10)
+.collect::<Vec<usize>>()
+.iter()
+.map(|_| Keypair::random())
+.collect();
+let initial_validator_deposits = keypairs
+.iter()
+.map(|keypair| Deposit {
+branch: vec![], // branch verification is not specified.
+index: 0,       // index verification is not specified.
+deposit_data: DepositData {
+amount: 32_000_000_000, // 32 ETH (in Gwei)
+timestamp: genesis_time - 1,
+deposit_input: DepositInput {
+pubkey: keypair.pk.clone(),
+withdrawal_credentials: Hash256::zero(), // Withdrawal not possible.
+proof_of_possession: create_proof_of_possession(&keypair),
+},
+},
+})
+.collect();
+
+// Genesis chain
+let _chain_result = BeaconChain::genesis(
+state_store.clone(),
+block_store.clone(),
+slot_clock,
+genesis_time,
+latest_eth1_data,
+initial_validator_deposits,
+spec,
+fork_choice,
+);
+}
+*/