Hook the add map activity search box into Google maps service

[ahal]

At the moment it just interprets input as an address and tries to spit out a lat/long. This means if you search something like "Younge and Dundas" it will have no idea what to do. Instead we should make a call to the Maps API to get the same results as if they typed into Google maps. Failing this we should remove this feature and just allow users to select a city.