fix grunt

Gruntfile.js

@@ -73,7 +73,7 @@ module.exports = function(grunt) {
       },
       config: {
         files: ['config.js'],
-        tasks: ['shell:dev', 'concat:main']
+        tasks: ['exec:dev', 'concat:main']
       },
       test: {
         files: ['test/**/*.js'],

browser-extensions/chrome/build.sh

@@ -35,7 +35,7 @@ mkdir -p $APPDIR
 
 # Re-compile copayBundle.js
 echo "${OpenColor}${Green}* Generating copay bundle...${CloseColor}"
-grunt --target=dev shell
+grunt prod
 checkOK
 
 # Copy all chrome-extension files