chore: repo maintenance + no path dependencies (#991)

- Move `tokio` into its own directory.
- Remove `path` dependencies.
- Run tests with once with crates.io dep and once with patched dep.

tokio-tcp/Cargo.toml

@@ -20,8 +20,8 @@ TCP bindings for tokio.
 categories = ["asynchronous"]
 
 [dependencies]
-tokio-io = { version = "0.1.6", path = "../tokio-io" }
-tokio-reactor = { version = "0.1.1", path = "../tokio-reactor" }
+tokio-io = "0.1.6"
+tokio-reactor = "0.1.1"
 bytes = "0.4"
 mio = "0.6.14"
 iovec = "0.1"
@@ -29,4 +29,4 @@ futures = "0.1.19"
 
 [dev-dependencies]
 env_logger = { version = "0.5", default-features = false }
-tokio = { version = "0.1.13", path = ".." }
+tokio = "0.1.13"