fix(grunt): Upgrade autoprefixer to postcss

Removes the deprecated grunt-autoprefixer with grunt-postcss.

Closes #1132

Author: bwaang

templates/common/root/_Gruntfile.js

@@ -58,11 +58,11 @@ module.exports = function (grunt) {
       },<% } %><% if (compass) { %>
       compass: {
         files: ['<%%= yeoman.app %>/styles/{,*/}*.{scss,sass}'],
-        tasks: ['compass:server', 'autoprefixer:server']
+        tasks: ['compass:server', 'postcss:server']
       },<% } else { %>
       styles: {
         files: ['<%%= yeoman.app %>/styles/{,*/}*.css'],
-        tasks: ['newer:copy:styles', 'autoprefixer']
+        tasks: ['newer:copy:styles', 'postcss']
       },<% } %>
       gruntfile: {
         files: ['Gruntfile.js']
@@ -184,13 +184,15 @@ module.exports = function (grunt) {
     },
 
     // Add vendor prefixed styles
-    autoprefixer: {
+    postcss: {
       options: {
-        browsers: ['last 1 version']
+        processors: [
+          require('autoprefixer-core')({browsers: ['last 1 version']})
+        ]
       },
       server: {
         options: {
-          map: true,
+          map: true
         },
         files: [{
           expand: true,
@@ -534,7 +536,7 @@ module.exports = function (grunt) {
       'clean:server',
       'wiredep',
       'concurrent:server',
-      'autoprefixer:server',
+      'postcss:server',
       'connect:livereload',
       'watch'
     ]);
@@ -549,7 +551,7 @@ module.exports = function (grunt) {
     'clean:server',
     'wiredep',
     'concurrent:test',
-    'autoprefixer',
+    'postcss',
     'connect:test',
     'karma'
   ]);
@@ -559,7 +561,7 @@ module.exports = function (grunt) {
     'wiredep',
     'useminPrepare',
     'concurrent:dist',
-    'autoprefixer',
+    'postcss',
     'ngtemplates',
     'concat',
     'ngAnnotate',

templates/common/root/_package.json

@@ -2,9 +2,9 @@
   "name": "<%= _.slugify(appname) %>",
   "private": true,
   "devDependencies": {
+    "autoprefixer-core": "^5.2.1",
     "grunt": "^0.4.5",
     "grunt-angular-templates": "^0.5.7",
-    "grunt-autoprefixer": "^2.0.0",
     "grunt-concurrent": "^1.0.0",
     "grunt-contrib-clean": "^0.6.0",<% if (coffee) { %>
     "grunt-contrib-coffee": "^0.12.0",<% } %><% if (compass) { %>
@@ -23,6 +23,7 @@
     "grunt-jscs": "^1.8.0",<% } %>
     "grunt-newer": "^1.1.0",
     "grunt-ng-annotate": "^0.9.2",
+    "grunt-postcss": "^0.5.5",
     "grunt-svgmin": "^2.0.0",
     "grunt-usemin": "^3.0.0",
     "grunt-wiredep": "^2.0.0",