Create custom parser for invoice report

On version 8 the account_print_invoice that we were using as base
parser for print invoice report is deprecated, whit this commit we
replicate the entire behavior on our custom parser for prevent
localization crash on new version

Ya no hereda del account_print_invoice en lugar de eso hereda de openerp.report

l10n_mx_facturae/report/account_print_invoice.py

@@ -26,9 +26,9 @@ import string
 import logging
 import base64
 import StringIO
+import time
 
 from openerp.tools.translate import _
-from openerp.addons.account.report import account_print_invoice
 from openerp.report import report_sxw
 import openerp
 import qrcode
@@ -36,11 +36,13 @@ import qrcode
 logger = logging.getLogger(__name__)
 
 
-class PrintInvoice(account_print_invoice.account_invoice):
+class PrintInvoice(report_sxw.rml_parse):
+
     def __init__(self, cr, uid, name, context):
         super(PrintInvoice, self).__init__(cr, uid, name, context=context)
 
         self.localcontext.update({
+            'time': time,
             'get_taxes': self._get_taxes,
             'get_taxes_ret': self._get_taxes_ret,
             'get_text_promissory': self._get_text_promissory,