[ADD] l10n_in_account_voucher : Add module for voucher report

- Task: https://www.odoo.com/web#id=7978&view_type=form&model=project.task&action=333&active_id=131
- Pad: https://pad.odoo.com/p/r.OUbis9qmMbFzF8J9
This lines causes this crash when I try to print the Voucher: 

```python
2014-10-13 09:35:53,044 31231 ERROR master werkzeug: Error on request:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/werkzeug/serving.py", line 177, in run_wsgi
    execute(self.server.app)
  File "/usr/lib/python2.7/site-packages/werkzeug/serving.py", line 165, in execute
    application_iter = app(environ, start_response)
  File "/home/richard/odoo/openerp/service/server.py", line 234, in app
    return self.app(e, s)
  File "/home/richard/odoo/openerp/service/wsgi_server.py", line 216, in application
    return application_unproxied(environ, start_response)
  File "/home/richard/odoo/openerp/service/wsgi_server.py", line 202, in application_unproxied
    result = handler(environ, start_response)
  File "/home/richard/odoo/openerp/http.py", line 1215, in __call__
    return self.dispatch(environ, start_response)
  File "/home/richard/odoo/openerp/http.py", line 1189, in __call__
    return self.app(environ, start_wrapped)
  File "/usr/lib/python2.7/site-packages/werkzeug/wsgi.py", line 588, in __call__
    return self.app(environ, start_response)
  File "/home/richard/odoo/openerp/http.py", line 1189, in __call__
    return self.app(environ, start_wrapped)
  File "/usr/lib/python2.7/site-packages/werkzeug/wsgi.py", line 588, in __call__
    return self.app(environ, start_response)
  File "/home/richard/odoo/openerp/http.py", line 1189, in __call__
    return self.app(environ, start_wrapped)
  File "/usr/lib/python2.7/site-packages/werkzeug/wsgi.py", line 588, in __call__
    return self.app(environ, start_response)
  File "/home/richard/odoo/openerp/http.py", line 1356, in dispatch
    result = ir_http._dispatch()
  File "/home/richard/odoo/openerp/addons/base/ir/ir_http.py", line 130, in _dispatch
    return self._handle_exception(e)
  File "/home/richard/odoo/openerp/addons/base/ir/ir_http.py", line 100, in _handle_exception
    return request._handle_exception(exception)
  File "/home/richard/odoo/openerp/http.py", line 596, in _handle_exception
    return super(HttpRequest, self)._handle_exception(exception)
  File "/home/richard/odoo/openerp/addons/base/ir/ir_http.py", line 126, in _dispatch
    result = request.dispatch()
  File "/home/richard/odoo/openerp/http.py", line 614, in dispatch
    r = self._call_function(**self.params)
  File "/home/richard/odoo/openerp/http.py", line 283, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "/home/richard/odoo/openerp/service/model.py", line 113, in wrapper
    return f(dbname, *args, **kwargs)
  File "/home/richard/odoo/openerp/http.py", line 280, in checked_call
    return self.endpoint(*a, **kw)
  File "/home/richard/odoo/openerp/http.py", line 733, in __call__
    return self.method(*args, **kw)
  File "/home/richard/odoo/openerp/http.py", line 376, in response_wrap
    response = f(*args, **kw)
  File "/home/richard/odoo/addons/report/controllers/main.py", line 117, in report_download
    response = self.report_routes(reportname, docids=docids, converter='pdf')
  File "/home/richard/odoo/openerp/http.py", line 376, in response_wrap
    response = f(*args, **kw)
  File "/home/richard/odoo/addons/report/controllers/main.py", line 64, in report_routes
    pdf = report_obj.get_pdf(cr, uid, docids, reportname, data=options_data, context=context)
  File "/home/richard/odoo/openerp/api.py", line 237, in wrapper
    return old_api(self, *args, **kwargs)
  File "/home/richard/odoo/addons/report/models/report.py", line 181, in get_pdf
    html = self.get_html(cr, uid, ids, report_name, data=data, context=context)
  File "/home/richard/odoo/openerp/api.py", line 237, in wrapper
    return old_api(self, *args, **kwargs)
  File "/home/richard/odoo/addons/report/models/report.py", line 156, in get_html
    return particularreport_obj.render_html(cr, uid, ids, data=data, context=context)
  File "/home/richard/odoo/openerp/api.py", line 237, in wrapper
    return old_api(self, *args, **kwargs)
  File "/home/richard/odoo/openerp/api.py", line 332, in old_api
    result = method(recs, *args, **kwargs)
  File "/home/richard/odoo/addons/l10n_in_account_voucher/report/account_voucher_report.py", line 44, in render_html
    return report_obj.render('l10n_in_account_voucher.report_voucher', docargs)
  File "/home/richard/odoo/openerp/api.py", line 235, in wrapper
    return new_api(self, *args, **kwargs)
  File "/home/richard/odoo/openerp/api.py", line 552, in new_api
    result = method(self._model, cr, uid, self.ids, *args, **kwargs)
  File "/home/richard/odoo/addons/report/models/report.py", line 100, in render
    context.update(inherit_branding=True)  # Tell QWeb to brand the generated html
  File "/home/richard/odoo/openerp/tools/misc.py", line 1260, in update
    raise NotImplementedError("'update' not supported on frozendict")
NotImplementedError: 'update' not supported on frozendict
```