Merge pull request #51 from dgalaktionov/master

Added music to the levels
Merge pull request #52 from dgalaktionov/master

Added weapon sounds
Merge pull request #53 from dgalaktionov/master

All weapons are in-game now
fixed name bugs. (again -.-)
Merge pull request #54 from IagoLast/master

fixed name bugs. (again -.-)
Fixed bug loops=-1
Update .gitignore
Deleted tmp files
Added attack effect
Added documentation to Characters package.
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.
Health and shield are now separate. Shield regenerates, health doesn't.
Now grenades do damage, different bullets have different damages and
fixed a problem with the "magic numbers".