Added attack effect
Merge pull request #55 from hmourit/master

Added documentation to Characters package.
Added Yed files.
Merge pull request #56 from IagoLast/master

Added Yed files.
Fixed identation bugs.
Added reference to director in enemy and enemy controller.
Created loop: die -> message -> main menu.
Added AI raytracing.
Added bosses, minions and logic to level 1 and level 4. Fixed _init_ in Enemy and Player.
Merged my changes with Martina's.
Mask was missing, fixed that.
Merge pull request #58 from martinaLopez/master

Added bosses, minions and logic to level 1 and level 4. Fixed _init_ in Enemy and Player.
Now you go to the next level when you kill the boss. You still can
transit with ENTER, for debugging comfort.
Merge pull request #60 from dgalaktionov/master

The game is complete now
Improved raytracing implementation.
In my pc the FPS never drops even if all enemies on the scene are chasing you.
Fixed third level's map background
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
FUCK GIT
Merge pull request #61 from dgalaktionov/master

Now enemies flash in red when you hit them
Big commit:
Created 2 different controllers, a melee one, and a range one.
Fixed centurion.png transparency.
Added cooldown to enemy hit effect.
Removed some enemies on levels.
Changed some weapons hit damage.
Added support for friendly fire.
Fixed attack cooldown bug.
Replaced hit_by_bullet function by receive_attack.
Inreased bullet collision rectangle size.
Maybe something else I can't remember.
Updated UML diagrams.