Adds cleaning task and default task

gulpfile.js

@@ -4,6 +4,8 @@ var karma = require('karma');
 var es = require('event-stream');
 var mainBowerFiles = require('main-bower-files');
 var exists = require('path-exists').sync
+var Q = require('q');
+var del = require('del');
 
 var pipes = {};
 
@@ -147,3 +149,21 @@ gulp.task('test', function(done) {
 gulp.task('build-dev', pipes.builtIndexDev);
 
 gulp.task('build-prod', pipes.builtIndexProd);
+
+pipes.cleanDir = function(dir) {
+}
+
+gulp.task('clean-dev', function() {
+    return del([paths.distDev]);
+});
+
+gulp.task('clean-prod', function() {
+    return del([paths.distProd]);
+});
+
+
+gulp.task('clean-build-dev', ['clean-dev'], pipes.builtIndexDev);
+
+gulp.task('clean-build-prod', ['clean-prod'] , pipes.builtIndexProd);
+
+gulp.task('default',['clean-build-prod'])