raise 404 error when the event removed the invited email user
Merge pull request #36 from xHFT/invete_nonapp_user

raise 404 error when the event removed the invited email user
check the email is valid
Merge pull request #37 from xHFT/invete_nonapp_user

check the email is valid
fix send message error
Merge pull request #38 from xHFT/invete_nonapp_user

fix send message error
change default mail sender
Merge remote-tracking branch 'origin/dev' into dev
change the user_can_view method
Merge pull request #39 from xHFT/invete_nonapp_user

change the user_can_view method
Merge pull request #40 from xHFT/dev

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