Notes and research for Message Queue.
"Message Queue" -> "Event Queue".
Start outlining Event Queue.
Fix #69.

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Fix #76.
Fix #77.
Fix #78.
Fix #79.
Fix #81.
Merge pull request #82 from GreenLightning/master

Fix typo in Observer: gracful -> graceful
Regenerate HTML.
Outline for Event Queue.
Couple of tiny fixes.
Start first draft of Event Queue.
Fix #85.
Fix #88.

Use "virtual" for overridden methods.
Work on first draft of Event Queue.
Finish first draft of Event Queue.
Start second draft of event queue.
More work on second draft of Event Queue.