feat(doc): add "ng doc" command

addon/ng2/commands/doc.ts

@@ -0,0 +1,26 @@
+import * as Command from 'ember-cli/lib/models/command';
+import * as DocTask from '../tasks/doc';
+
+const DocCommand = Command.extend({
+  name: 'doc',
+  description: 'Opens the official Angular documentation for a given keyword.',
+  works: 'everywhere',
+
+  anonymousOptions: [
+    '<keyword>'
+  ],
+
+  run: function(commandOptions, rawArgs:Array<string>) {
+    var keyword = rawArgs[0];
+
+    var docTask = new DocTask({
+      ui: this.ui,
+      analytics: this.analytics,
+      project: this.project
+    });
+
+    return docTask.run(keyword);
+  }
+});
+
+module.exports = DocCommand;

addon/ng2/index.js

@@ -13,7 +13,8 @@ module.exports = {
       'lint': require('./commands/lint'),
       'format': require('./commands/format'),
       'version': require('./commands/version'),
-      'completion': require('./commands/completion')
+      'completion': require('./commands/completion'),
+      'doc': require('./commands/doc')
     };
   }
 };

addon/ng2/tasks/doc.ts

@@ -0,0 +1,11 @@
+import * as Task from 'ember-cli/lib/models/task';
+import * as opn from 'opn';
+
+const DocTask = Task.extend({
+  run: function(keyword:string) {
+    var searchUrl = 'https://angular.io/docs/ts/latest/api/#!?apiFilter=' + keyword; 
+    return opn(searchUrl);
+  }
+});
+
+module.exports = DocTask;

package.json

@@ -43,6 +43,7 @@
     "leek": "0.0.21",
     "lodash": "^4.6.1",
     "multidep": "^2.0.0",
+    "opn": "4.0.1",
     "resolve": "^1.1.7",
     "shelljs": "^0.6.0",
     "silent-error": "^1.0.0",