Added update timers.
Merge branch 'master' of https://github.com/mozillamsu/australis-bugzilla-widget
Use a local favicon for the button.
Removed log statements.
User name and email are stored as preferences.
User name and email are stored in preferences. Now they persist across sessions.
Ignore XPIs.
Added a brief user manual to the README.
Added a brief Features section.
Bugs which have not been clicked before are marked as new.
Error checking now looks for any defined error, since error is a string on error, not a boolean.
Viewed bug lists are written to the preferences file.
Don't write the same bug ID to the viewed array twice.
Viewed bugs are read from the prefs file.