Split gulpfile.js into separate task files.

gulp/utils/error.js

@@ -0,0 +1,25 @@
+/*
+ * Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
+ * http://paperjs.org/
+ *
+ * Copyright (c) 2011 - 2016, Juerg Lehni & Jonathan Puckey
+ * http://scratchdisk.com/ & http://jonathanpuckey.com/
+ *
+ * Distributed under the MIT license. See LICENSE file for details.
+ *
+ * All rights reserved.
+ */
+
+var gulp = require('gulp'),
+    gutil = require('gulp-util'),
+    ERROR = gutil.colors.red('[ERROR]');
+
+gulp.on('error', function(err) {
+    var msg = err.toString();
+    if (msg === '[object Object]')
+        msg = err;
+    gutil.log(ERROR, err);
+    if (err.stack)
+        gutil.log(ERROR, err.stack);
+    this.emit('end');
+});