use more forgiving 'unstructured' query format in Bing Locations API

Bing's Locations API structured format (URL path) is fairly sensitive to common typos and cut-paste problems like having a newline char in the address or the user accidentally appending a non-alpha char in a zip code search (i.e. try adding a ] to a zip code search).

The optional unstructured query format uses the query string instead of the URL path and is less sensitive to input exceptions.

Read more here: http://msdn.microsoft.com/en-us/library/ff701711.aspx