Show output when building pge application
Remove old tags
Switch to the newly built official images

The official images are still from stackbrew, but they have recently rebuilt all images.
Bump passenger version
Upgrade ruby 1.9.2 and passenger
Update nginx and passenger versions
Update to ruby 2.1.3
Upgrade to nginx 1.6.2
Make sure to pull latest stackbrew when rebuilding everything
Upgrade bash to resolve CVE-2014-6271 and CVE-2014-7169
Remove container after pge image is built
Ensure all packages are up to date when installing pge app