[Merge] lp:~artmello/webbrowser-app/webbrowser-app-statesaver into lp:webbrowser-app

[Bill Filler]

Review: Needs Fixing

tried this out and there is one problem:

- for webapps (tested amazon and gmail), the state save/restore works only once and does not work correctly the second time
To test:
- open amazon
- navigate to a page
- kill -2 on the pid
- relaunch amazon
- verify that the last url was restored
- then navigate to a different page
- kill -2 on the pid
- relaunch amazon
- the first url that was saved is restored, not the last visited page

This works fine for webbrowser-app, just not webapps
-- 
https://code.launchpad.net/~artmello/webbrowser-app/webbrowser-app-statesaver/+merge/227737
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