Merge pull request #762 from kiike/pr/allow_skipping_building_nwjs

gruntfile: Add flag to skip building nwjs

Gruntfile.js

@@ -474,7 +474,10 @@ module.exports = function (grunt) {
  "nggettext_compile", //-- Extract English texts to the template file
  "copy:dist", //-- Copy the files to be included in the build package
  "json-minify", //-- Minify JSON files
- "nwjs", //-- Build the executable package
+
+ //-- Build the executable package with nwjs by default, and skip this task
+ //-- when the flag --dont-build-nwjs is passed
+ ... grunt.option('dont-build-nwjs') ? [] : ["nwjs"],
 
  //-- The clean:tmp task is also a common task, but it is
  //-- executed after the specific platform task