created nightlife_api.rb

Copied it from restaurant_api.rb and made updates
to code and comments, specifically replaced the
type= in the GET request from RESTAURANTS to
NIGHTLIFE
updated restaurant_api to account for
different variable in the response from Google.

When you use a string to make the GET request, you can ask for
FORMATTED_ADDRESS from the resulting response, but if you use
lat/long the address is entered in to VICINITY