Changed version constratints to be semantic versioning again

- in composer the `~` operator is just a shortcut for `~1.0` = `>=1.0.0,<2.0.0`
  it does not prevent dev versions to be installed but neither does `1.*`
- dev versions are constrolled via `minimum-stability` setting and the
  `@dev`, `@beta`, `@stable`,... settings.
- setting bower packages that ship compiled files only with the stable
  release to use `@stable` in composer.json of the applictaions. This
  setting can be removed when we remove the `minimum-stability=dev`
  setting after GA.

composer.json

@@ -17,7 +17,10 @@
         "php": ">=5.4.0",
         "yiisoft/yii2": "*",
         "yiisoft/yii2-bootstrap": "*",
-        "yiisoft/yii2-swiftmailer": "*"
+        "yiisoft/yii2-swiftmailer": "*",
+        "bower-asset/jquery": "@stable",
+        "bower-asset/jquery-ui": "@stable",
+        "bower-asset/jquery.inputmask": "@stable"
     },
     "require-dev": {
         "yiisoft/yii2-codeception": "*",