chore(package): switch from gulp-clean to del package

gulpfile.js

@@ -1,6 +1,7 @@
 var gulp = require('gulp');
 var runSequence = require('run-sequence');
-var clean = require('gulp-clean');
+var del = require('del');
+var vinylPaths = require('vinyl-paths');
 var to5 = require('gulp-6to5');
 var jshint = require('gulp-jshint');
 var stylish = require('jshint-stylish');
@@ -36,8 +37,8 @@ var compilerOptions = {
 var jshintConfig = {esnext:true};
 
 gulp.task('clean', function() {
-  return gulp.src([path.output], {read: false})
-    .pipe(clean());
+ return gulp.src([path.output])
+    .pipe(vinylPaths(del));
 });
 
 gulp.task('build-es6', function () {

package.json

@@ -36,10 +36,10 @@
   },
   "devDependencies": {
     "conventional-changelog": "0.0.11",
+    "del": "^1.1.0",
     "gulp": "^3.8.10",
     "gulp-6to5": "^1.0.2",
     "gulp-bump": "^0.1.11",
-    "gulp-clean": "^0.3.1",
     "gulp-jshint": "^1.9.0",
     "gulp-yuidoc": "^0.1.2",
     "jasmine-core": "^2.1.3",
@@ -50,7 +50,8 @@
     "karma-jasmine": "^0.3.2",
     "karma-jspm": "^1.0.1",
     "object.assign": "^1.0.3",
-    "run-sequence": "^1.0.2"
+    "run-sequence": "^1.0.2",
+    "vinyl-paths": "^1.0.0"
   },
   "aurelia": {
     "usedBy": [