RequestPool: initial implementation with TaskPool

dub.selections.json

@@ -1,7 +1,6 @@
 {
 	"fileVersion": 1,
 	"versions": {
-		"automem": "0.6.9",
 		"cachetools": "0.3.1",
 		"d-unit": "0.10.2",
 		"ddbc": "0.5.9",
@@ -12,12 +11,10 @@
 		"httparsed": "1.2.1",
 		"mysql-native": "3.1.0",
 		"odbc": "1.0.0",
-		"path-matcher": "1.1.3",
+		"path-matcher": "1.1.4",
 		"requests": "2.1.3",
 		"slf4d": "3.0.0",
 		"streams": "3.5.0",
-		"test_allocator": "0.3.4",
-		"undead": "1.1.8",
-		"unit-threaded": "0.10.8"
+		"undead": "1.1.8"
 	}
 }