[ADD] added new module hr_material

Hello,
I have added new module hr_material
purpose:
- which allows you to easily keep track of office materials.
- It stores information about the materials and it's status,whether it is assigned to some employee or department or it is in under repair(under maintenance) etc...
- An employee will send a maintenance request through the system if any fault is encountered in the material assigned to him.
For more detials see : https://pad.openerp.com/p/openerp-project.task-KM3TRSESU5
Thanks,
DKA