Resolve "Migrate SQLite to rustbreak"

Closes #76 (closed)

blockchain/Cargo.toml

@@ -18,9 +18,12 @@ duniter-module = { path = "../module" }
 duniter-network = { path = "../network" }
 duniter-wotb = { path = "../wotb" }
 log = "0.4.1"
+num_cpus = "1.8.0"
 pbr = "1.0.1"
 rand = "0.4.2"
+rustbreak = {version = "2.0.0-rc2", features = ["bin_enc"]}
 serde = "1.0.57"
 serde_derive = "1.0.57"
 serde_json = "1.0.17"
-sqlite = "0.23.9"
\ No newline at end of file
+sqlite = "0.23.9"
+threadpool = "1.7.1"
\ No newline at end of file