Implement task-local values

Author: Stjepan Glavina

Cargo.toml

@@ -15,7 +15,12 @@ categories = ["asynchronous", "concurrency"]
 async-fs = { path = "async-fs" }
 async-io = { path = "async-io" }
 async-net = { path = "async-net" }
-async-task = { path = "async-task" }
+async-spawn = { path = "async-spawn" }
+crossbeam = "0.7.1"
+futures-preview = "0.3.0-alpha.16"
+lazy_static = "1.3.0"
+num_cpus = "1.10.0"
+pin-utils = "0.1.0-alpha.4"
 
 [workspace]
 members = [
@@ -25,7 +30,6 @@ members = [
   "async-net",
   "async-pool",
   "async-spawn",
-  "async-task",
 ]
 
 [dev-dependencies]