Enhanced Redfin Data

Enhance redfin data with the following information:

* Distance to places (you can configure the places in the options page of the extension).
* Zillow estimates for the house.
* Google maps link.
* Up to date greatschools scores and direct link to greatschools.
* Move redfin panel to the top.

(Greatschools is tested only for California schools).

Source code: https://github.com/vickyg3/scripts/tree/master/redfin_location