add vendor css to watched files

Gruntfile.js

@@ -263,6 +263,7 @@ module.exports = function (grunt) {
     'copy:app',
     'copy:css_cartodb',
     'compass',
+    'copy:css_vendor_cartodb3',
     'copy:css_cartodb3',
     'sass',
     'concat:css'

lib/build/tasks/copy.js

@@ -145,6 +145,25 @@ exports.task = function (grunt) {
       }]
     },
 
+    css_vendor_cartodb3: {
+      files: [{
+        expand: true,
+        cwd: 'node_modules/cartoassets/src/scss/',
+        src: '**/*.scss',
+        dest: 'tmp/sass/cartoassets/'
+      }, {
+        expand: true,
+        cwd: 'node_modules/cartodb-deep-insights.js/themes/scss',
+        src: '**/*.scss',
+        dest: 'tmp/sass/deep-insights/'
+      }, {
+        expand: true,
+        cwd: 'node_modules/cartodb.js/themes/scss',
+        src: '**/*.scss',
+        dest: 'tmp/sass/cartodbjs_v4/'
+      }]
+    },
+
     js_cartodb: {
       files: [{
         expand: true,

lib/build/tasks/watch.js

@@ -47,9 +47,13 @@ exports.task = function () {
     css: {
       files: [
         'app/assets/stylesheets/editor-3/**/*.scss',
-        'app/assets/client/stylesheets/**/*.scss'
+        'app/assets/client/stylesheets/**/*.scss',
+        'node_modules/cartoassets/src/scss/**/*.scss',
+        'node_modules/cartodb-deep-insights.js/themes/scss/**/*.scss',
+        'node_modules/cartodb.js/themes/scss/**/*.scss'
       ],
       tasks: [
+        'copy:css_vendor_cartodb3',
         'copy:css_cartodb3',
         'sass',
         'concat:css'