Add l10n_ch_hr_payroll.

Swizerland Payroll Rules for Odoo.

Features list :
* Add Swiss salary rule categories
* Add Swiss salary rules
* Add children in school to employee
* Add LPP range to contract
Sorry if I was not clear enough, you can remove completely description from `__openerp__.py`

Since 8.0 if no description is present in `__openerp__.py` it will look up for a README file as you already created one. Thus we can have description only in README file to make it visible on both Github and in Odoo modules and we won't have to have to edit twice the description every time. So please simply remove `description` from dict in `__openerp__.py` as we now have a `README.rst`