Move "globaleaksadmin" binary to "gl-admin".

Keep a consistent naming with globaleaks scripts.
Remove 'gl-fix-permissions' run in postinst script.

It is useless as already run in globaleaks.init at the moment.
This fixes lintian warning:

W: globaleaks: command-with-path-in-maintainer-script postinst:5 /usr/bin/gl-fix-permissions
Restyle globaleaks init script.

* More informative Description, Short-Description
* Proper init info block:  <https://wiki.debian.org/LSBInitScripts> :
"""
On the other hand, all lines inside the block shall be of the form
 #{keyword}: arg1 [arg2...]
"""
Fix errors running virtualbox script.

We don't really need all this virtualbox-ose hack, so I'm just removing them.
Fix lintian warning "debian-changelog-has-wrong-weekday".

Similarly to 676300e5474e, there was another wrong release weekday.
Fix lintian warning "maintainer-script-without-set-e".

Add a "set -e" on the top of each maintainer script.
Use /bin/sh instead of /bin/bash in postrm script.

.. and remove bashism polluting the user output.
Move maintainer scripts to the <package>.script notation.

This will allow further pacages to be added to this source.
Add partially-working, draft for packer template "ubuntu-12.04.json".