chore(grunt): add load-grunt-tasks module

Clean up repetitive loading of grunt tasks

Closes angular-ui#120

Author: BaconSoap

Gruntfile.js

@@ -4,10 +4,7 @@ module.exports = function (grunt) {
   var initConfig;
 
   // Loading external tasks
-  grunt.loadNpmTasks('grunt-contrib-jshint');
-  grunt.loadNpmTasks('grunt-contrib-watch');
-  grunt.loadNpmTasks('grunt-karma');
-  grunt.loadNpmTasks('grunt-conventional-changelog');
+  require('load-grunt-tasks')(grunt);
 
   // Project configuration.
   initConfig = {

package.json

@@ -24,6 +24,7 @@
     "grunt-contrib-watch": "~0.5.3",
     "grunt-karma": "~0.6.2",
     "karma": "~0.10.2",
-    "grunt-conventional-changelog": "~1.0.0"
+    "grunt-conventional-changelog": "~1.0.0",
+    "load-grunt-tasks": "~0.2.0"
   }
 }