Adding some missing files, not tested yet, just commiting and pushing to be able to work from laptop on cabure
Starting HUD development: HUD main class.

View MantisBT issues #208 and #209
(http://cordobazombie.com.ar/dev/tracker/view.php?id=208)
XML file for ZombieUnit
Adding firing_system module to be able to compile other stuff.
Adding ZombieUnitBuilder class, did a little test and seems to be working, we need more textures / zombies to do a deeper test and finish the ZombieBody stuff to test with bodyParts.
Now ZombieBody and ZombieUnit is more complete. Fixing some issues
HUD: creating file structure + classes skeletons
Adding the missing ZombieUnit States.
Fixing some issues in a some classes.
Integrating all the functionality for the zombieUnit and ZombieBody and FiringSystem
Adding BulletShape.
Adding the Physics Bounding Box to the zombies, we still need to modify once we get the issue 217 resolved (graphics).
Having problems with the orientation of the node, the zombies were exported using the Y axis and should be Z axis as the Up Vector, all the Ragdoll logic was created for those zombies, now, the bones have different orientations and we will not rebuilt all the ragdolls for now, instead we will try to rotate the zombie node everytime we move or rotate the zombie, ugly but is the only way without too much changes.
Using 2 sceneNodes per Zombie now to avoid the UpVector issue
HUD: transitional commit, to keep on in Agus place

Few additions to HUD and HUDelement taken from sample files in:
http://goo.gl/uaYlB7
Useful code exemplifying Ogre::{Overlay,OverlayContainer} usage
comes from ConfigState.{h,cpp} in that link.
Fixing some issues, adding some other stuffs, a tool test also
HUDelement "weapon" implemented. Testing is due.
HUD: super basic test up and running!
HUD: building properly, but weapon change fails.
HUD: unified HUD update callback.
HUD: added HUDbullet class, with weapon swap logic

TODO: display and update bullet count,
      via Ogre::TextAreaOverlayElement and cz::Weapon*.
HUD: bullet count update on weapon swap.

TODO: HUD firing and reloading update (add MainPlayer callback)
HUD: all functionality finished.

Includes MainPlayer integration via cz::linker::linkMainPlayerWithHUD()
TODO list: add weapon cross in mid-screen?
           fix MainPlayer to fully test integration with HUD.
Merge branch 'HUD' into cordobazombie0.1
Intro Main State is working until the point of unloading the resources where we get the following problem: <<DEBUG[/home/raul/Programacion/CordobaZombie/src/resources_handler/ResourceHandler.cpp, unloadResourceGroup, 151]: Resource group /home/raul/Dropbox/cordobazombie0.1/game/main_states/intro_main_state/resources.cfg has no resources associated (sections)>>