Persistent image mode + nodegoat configs

If the application-specific container is too heavy to rebuild its image
every time the application needs to me run, the TestREx can be
instructed not to destroy the image after the execution is finished. To
do this, simply add the “—persistent” flag.

Example:
“sudo python run.py —persistent —manual
Wordpress3.2__ubuntu-apache-mysql”
Renewed the Wordpress app