Adds address autocompletion



![auto-complete](https://www.evernote.com/shard/s190/sh/56adea66-f144-454a-a3c8-df59c1c0a240/44d26decbe1a092ff3185aa9ca5bc913/deep/0/Hack%20For%20Athens%20%7C%20Open%20Data%20Portal%20Demo.png)