Merge deploy user to apps

[hzmangel]

Currently the user for deployment is deploy, while for running application is apps. This devision may cause permission problems, such as the one described in issue #5. The user deploy only works on deployment of webapps, so I think they can be merged to one account apps.

[andrewhavens]

Anything stopping this from getting merged?

[arrtchiu]

The code in this PR gives the apps user full sudoer access with no password. I think from a "secure by default" point of view this shouldn't be merged since a minor RCE bug in a web app can trivially be escalated to full root access.

Instead of running rake tasks as the deploy user, why not use sudo to impersonate the apps user? sudo -u apps RAILS_ENV=production bin/rake my:task

[thekindofme]

Agree with @arrtchiu on this.