rename build.js --> bundle.js (build step include preprocess.js)

Author: etpinard

tasks/build.js renamed to tasks/bundle.js

@@ -1,18 +1,19 @@
 var fs = require('fs');
+
 var browserify = require('browserify');
 var UglifyJS = require('uglify-js');
 
 var compressAttributes = require('./util/compress_attributes');
 var constants = require('./util/constants');
 
-
 /*
  * This script takes one argument
  *
  * Run `npm run build -- dev` or `npm run build -- --dev`
  * to include source map in the plotly.js bundle
  *
  */
+
 var arg = process.argv[2];
 var DEV = (arg === 'dev') || (arg === '--dev');