Need to do `app stop` && `app start` after creating/destroying service, so ENV variables can update

[LiAh Sheep]

Steps to reproduce:

1. Create an app
2. Pull from [e-mail]:liahsheep/sample-php.git
3. Go to http://_____.app.cnpaas.localhost/env.php, note the result
4. Create a service
5. Reload http://_____.app.cnpaas.localhost/env.php, note MYSQL_ variables are NOT added
6. Stop and start app
7. Reload http://_____.app.cnpaas.localhost/env.php, note MYSQL_ variables are finally added

[LiAh Sheep]

Seems to be known issue for OpenShift. Refer to http://stackoverflow.com/a/28507502/1316828

[LiAh Sheep]

Fixed by pull request #131

after_delay_create & after_delay_destroy