0.7 release to AMO

[michielbdejong]

After https://github.com/tosdr/tosdr-firefox/pull/56 is merged, it makes sense to do an 0.7 release, which will improve:

• display rating on other domains as well as on main domain (e.g. google.fr as well as google.com
• download only one file on startup of the background.js script instead of 85
• run the check only once per time a tab is loaded instead of ~6 times
• access browser.storage.local only about twice instead of about 50 times per check

Two issues:

• I would like to find out how the add-on gets updated in people's browsers once a new version becomes available on AMO (I might test that with a sample submission)
• I would like to have access to this plugin's listing on AMO. Currently it looks like only @AbdullahDiaa and @hugoroy have access: https://addons.mozilla.org/en-US/firefox/addon/terms-of-service-didnt-read/. As mentioned in https://github.com/tosdr/browser-extensions/issues/18 we can probably set up 'Group Publishing' in the Chrome Web Store, but I don't think AMO supports that. My AMO user is michielbdejong, maybe Abdullah or Hugo can add me?