cleaned up the code in js/background.js and the URL formatting

extension/data/urls.txt

 https://www.bing.com/
 https://www.google.com/
-wikipedia
-
+https://en.wikipedia.org/wiki/Main_Page

extension/js/background.js

 var debug = 1;
 
-var urls_to_compare = readTextFile("data/urls.txt");
+var urls_to_compare = readTextFile("../data/urls.txt");
 
 /* this code base courtesty of https://stackoverflow.com/questions/14446447/javascript-read-local-text-file#14446538*/