Software Público Brasileiro

Some specific points:

- ./script/quick-start not works from start to end on a clean Debian
  wheezy system
- Gemfile: remove checking for programs since the Gemfile is not really
  the right place to do this
- Gemfile.lock: lock gem versions against Debian wheezy.  This assumes
  package versions in Debian wheezy + some backported packages available
  at http://people.debian.org/~terceiro/noosfero-wheezy-backports/
- db:data:minimal: add an explicit contact email to the new environment.
  This fixes a long standing issue: when installing Noosfero on a brand
  new system, exim MTA will choke on a malformed sender address, and
  abort the entire installation.
- added a simple Vagrantfile for development purposes

Pending:

- provide proper backports for packages and drop the temporary
  http://people.debian.org/~terceiro/noosfero-wheezy-backports/