[ADD] contract_digitized_signature (#102)

* [ADD] contract_digitized_signature

* Correct README and add signature_name

* Change to char field

* Improve tests to acchieve full coverage

contract_digitized_signature/models/account_analytic_account.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+# Copyright 2017 Tecnativa - Vicent Cubells
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from openerp import api, fields, models
+
+
+class AccountAnalyticAccount(models.Model):
+    _name = 'account.analytic.account'
+    _inherit = ['account.analytic.account', 'mail.thread']
+
+    customer_signature = fields.Binary(
+        string='Customer acceptance',
+    )
+    signature_name = fields.Char(
+        string='Signed by',
+    )
+
+    @api.model
+    def create(self, values):
+        contract = super(AccountAnalyticAccount, self).create(values)
+        if contract.customer_signature:
+            values = {'customer_signature': contract.customer_signature}
+            contract._track_signature(values, 'customer_signature')
+        return contract
+
+    @api.multi
+    def write(self, values):
+        self._track_signature(values, 'customer_signature')
+        return super(AccountAnalyticAccount, self).write(values)