Cleaned up the bottom javascript within calendar.html a little bit.
Added EmailStatus and EmailQueue; Also added Email.SaveAndSend() which
executes saving and senting independantly/async.

related to #17 #18 #19 #20
go fmt task.go
Added starting the EmailQueue to the top of boardinator;
Added async email.SaveAndSend() within the SendEmail
POST handler and changed the response to 'added
to the queue' rather than 'sent successfully';

related to #26 #20
go fmt email.go
Added HandleEmailError and changed how EmailStatus works.
SentStatus -> EmailStatus

Relates to #19
Added e.Status = and one call to HandleEmailError() to email.go
Moved the location of types.StartEmailQueue in boardinator.go
so that it actually gets started.
Made handleEmailError() private
Added TODO comment to Email.Save() in types/email.go