Experimental commit
Extracted convert method to a new file named background/favicon.js
Added comment for Utility.inArray method
Extact method to Utility.collect
Use chrome://favicon instead of web api to get favicon
Merge remote-tracking branch 'origin/favicon-url' into dev2.0.0
Changed histories order
Implemented method to open a url
Use chrome.tab.create or chrome.tab.update to open a url
Use chrome://favicon method to get a favicon also in searchHistories