The user is able to set the check time for automatic purged processing and current session.
Add the value to represent that can't get the url in checkExcludeList function.
Show the correct message on browser Action.

Because has been modified to use the bit shift, fix the bug that branch processing has not been performed correctly.
The purge page to use indexedDB.

Fix the bug that don't show the page icon in purging tab.
Delete arguments of deleteDatabase function in the Database class.
Change of description.
Fix the bug that don't restore the session correctly.
I forget the session name of indexedDB use global variable in purge.js.
When the tab is purged, fix the problem that adds multiple history.