add ensureEmptyDir() and ensureEmptyDirSync()

package.json

@@ -28,24 +28,24 @@
   "dependencies": {
     "@types/fs-extra": "0.x.x",
     "@types/q": "0.x.x",
-    "@types/vinyl": "^1.1.29",
-    "beautylog": "^5.0.23",
-    "fs-extra": "^0.30.0",
-    "glob": "^7.1.0",
-    "js-yaml": "^3.6.1",
+    "@types/vinyl": "^2.0.0",
+    "beautylog": "^6.0.0",
+    "fs-extra": "^1.0.0",
+    "glob": "^7.1.1",
+    "js-yaml": "^3.7.0",
     "q": "^1.4.1",
-    "request": "^2.75.0",
+    "request": "^2.79.0",
     "require-reload": "0.2.2",
-    "smartpath": "^3.2.2",
+    "smartpath": "^3.2.7",
     "typings-global": "^1.0.14",
-    "vinyl": "^1.2.0",
+    "vinyl": "^2.0.1",
     "vinyl-file": "^2.0.0"
   },
   "devDependencies": {
     "@types/should": "^8.1.30",
-    "gulp-function": "^1.3.6",
-    "npmts-g": "^5.2.8",
-    "should": "^11.1.0",
+    "gulp-function": "^2.2.3",
+    "npmts-g": "^5.2.10",
+    "should": "^11.1.2",
     "typings-test": "^1.0.3"
   }
 }