support for Google Places autocomplete feature on Location question type

When preparing the questionnaire about urban mobility in Fortaleza (http://lis.cua.li/615913/), I was asked to include the address autocomplete feature, which is quite common in the Google Maps applications.


The main changes occurred in the application/helpers/qanda_helper.php and scripts/map.js where much of the exisiting code was reorganized.

At the level of my template, I do hide by CSS the input text containing the coordinates, while pushing the autocompleted field over the map.