replace simple-storage with sqlite
squashme: add domain stuff
replace simple-storage by sqlite
remove unused simple-storage import
rename function names in tabdatabase
minor documentation fixes in main.js
storage and database unit tests and fixes
tab grouping features: by "browsing session"
fix code consistency issues with ID vs _id
refactor tab operations into TabController object
unfound favicons in tabcontroller now attempt to get loaded from google
url list in index.html now anchor tags instead of buttons
remove wrong license information in main.js
use strict in TabController
some tabController tests
remove assertion in test-TabDatabase. the database will have already be created and the assumption is no longer true
added duplicate removal by closing tabs before storage. created as a config option.