added file to replace dataGrabber.js

it should replace dataGrabber.js when dadosabertos server is down.
express.js module added to project
sending json to user

- user can now query a bus line and our server will respond with a json
containing that information
- using a fake datGrabber file to be used when dataGrabber can not
fetch data from dadosabertos server (for the times when it is down)
sending data to parent right after fetching it

dataGrabber is now sending the data object to the parent thread as soon
as it creates it. then, ‘data’ gets out of scope and can be colected by
the garbage collector