Added animation and fixed obj for human entity

Obj wasn't exported in the right way for the mesh loader. Fixed.

Animations : Walk[Arms] - Walk[Legs] - Walk[Interact] - Sneak[Arms] -
Sneak[Interact]

Sprint[Legs], Sprint[Arms] and DoNothing[Arms] aren't already done. 

You'll have to mix animations, like Walk[Legs] + Walk[Arms] or
Walk[Legs] + Walk[Interact] to get a full movement.
Tip : Walk[Legs] can be used for sneak walking.

I put the blend file if anyone wants to do something.
I did it in the way L5D said me to do, he's going to test it soon.


Signed-off-by: Thomas LAMSON <tomlabete@numericable.fr>