Monthly donation email hook

[erictshen]

Fixes #125

Added a command for running monthly donation email jobs. Will add a job to heroku when this gets merged in.

@andylouisqin will also be working on email text once this gets merged in.

Example email from the terminal.

[noahsark769]

Can we call this something semantic? How about MonthlyDonationEmailCommand?

[erictshen]

Django expects something called Command =(

[noahsark769]

Oh bleh, okay

[noahsark769]

We need tests!

[erictshen]

Tests currently fail. Main reason why is that we can't override the created_at variable for the payments.

FactoryBoy/factory_boy#102

Will most likely implement this the first way mentioned in that link, unless you'd prefer some other way of fixing this issue.

[erictshen]

Updated factory boy so we can override the created_at attribute! Passes tests now, let me know if you would like more test coverage.

[noahsark769]

You actually don't need to specify all of these values, you can just say Payment.factories.donation.create(created_at=...). Everything else doesn't really matter, so no need to include it

[noahsark769]

@erictshen I think we should add two more tests: (1) one where we mock out the return value of .now() and make sure that we can run the command with override=False, and (2) one where we run the command from some random day of the month that's not the first day, and make sure that only the donations from the previous MONTH get tracked (not donations from the past 30 DAYS, which may be different than the past month).

Also, it might make sense to send the admins an email when this job is done running, like "An automatic batch of monthly donation engagement emails was sent" or something like that. What do you think - should be pretty easy to do, since we don't need a fancy email template and I believe we have a utility function to get all administrator emails already.

[noahsark769]

Can we say that the command was not actually run? Or something about using --override to force it? Also we should at least end this sentence with a period :)

[erictshen]

Added additional test coverage. Also added a command line arguments to email administrators when the monthlydonationemail command is run, I can make it default behavior if you'd prefer.

[noahsark769]

Two more things!

1. I think that emailing admins should be the default behavior
2. I think that in the docstring for the Command, we should specify the functionality about only emailing people who have donated within the previous month, not the previous 30 days.

New tests look good!

[noahsark769]

1. Need to add tests to check that emails to admins are sent
2. Admin email template should include the number of donation emails sent in the batch, I think

[noahsark769]

Ship it!

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