[FIX] crm_partner_assign: more precise geolocation

Google api geolocation service returns a precise latitude and longitude, greater or equal than 5 digits
The precision is important as storing 2 digits instead of 5 can lead to an inaccuracy of allmost half a mile.
Merge remote-tracking branch 'odoo/7.0' into 7.0
Merge remote-tracking branch 'oca/7.0' into 7.0