Revert "Merge pull request #200 from sigp/new-structure"

This reverts commit d7a3545be1, reversing
changes made to 1da06c156c.

beacon_node/db/src/lib.rs

@@ -0,0 +1,14 @@
+extern crate blake2_rfc as blake2;
+extern crate bls;
+extern crate rocksdb;
+
+mod disk_db;
+mod memory_db;
+pub mod stores;
+mod traits;
+
+use self::stores::COLUMNS;
+
+pub use self::disk_db::DiskDB;
+pub use self::memory_db::MemoryDB;
+pub use self::traits::{ClientDB, DBError, DBValue};