Creation of arm.blend, arm.blend1 and arm.blend2.

- These files are the left arm's mesh.
- Only less than half of the arm is done.
Merge branch 'Grupo-A' of https://github.com/eloipuertas/ES2013Dimarts into Grupo-A
arm.blend, arm.blend1 and arm.blend2 modified

-The arm's mesh has been improved, now there's an arm 'til de hand, hand not included yet.
arm.blend, arm.blend1 and arm.blend2 edited.

- Mesh completed, materials and textures left.
- Do not edit this file, if you want to import the armature create,
  another file.