Merge pull request #7459 from creocoder/fix-applications

Fix application templates and official extensions `composer.json`

composer.json

@@ -18,7 +18,7 @@
         }
     ],
     "require": {
-        "yiisoft/yii2": "*",
+        "yiisoft/yii2": "~2.0.0",
         "bower-asset/bootstrap": "3.3.* | 3.2.* | 3.1.*"
     },
     "autoload": {