Added submodules for target provisioning.

These submodules will be used to deploy targets with chef cookbooks.

Targets:
  - Dvwa
  - Vicnum
  - Gruyere
  - Bricks
First attempt to implement targets feature.

This is a POC for targets feature who consist to deploy vulnerables
machines with your Kali linux.

Targets are provisioned with chef cookbooks, cookbook's dependencies are
managed by berkshelf. So you need vagrant-berkshelf plugin.

Target cookbooks are stored in ~cookbooks~ directory.

Targets definitions are stored in ~targets/~ directory.
Added new base box Kali linux 1.0.4

This base box fixes some issues with network and works fine with
vagrant 1.2.x.

It is based from Kali linux 1.0.4

Boxes section improvement in readme.
Don't provision emacs24 (there is some errors with cookbook).
Change box for target provisioning.

Use Debian Squeeze 64bits from puppetlabs.
Merge branch 'targets-feature'