0.4.0 release checklist

[erikh]

• [x] Fix notifications in google #19
• [x] #43
• [x] sui error handling #36
• [x] Query Window configuration var #33
• [x] DB corruption bug #37
• [x] Update README's sui screenshot
• [x] #45
• [x] Fix memorydb duplication bug #42
• [x] #47
• [x] #51

[erikh]

I've removed attendance support for Google Calendar as a target feature. I think this would be better done in later releases.