Remove email field before saving user to db

[halfwhole]

This PR removes the email field (if it exists) from user objects that are to be saved to the database - it acts as a fail-safe in case the object still contains an email

For more context, see #339

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[gauravkeerthi]

I will not merge this PR yet.
I suggest we run the migrations, then check the database manually to see if all email fields have been removed. If that is successful, then we monitor the game for a few days and see what happens as new users sign up and play. If no email fields are added, then I think this PR may not be necessary.

[halfwhole]

I suggest we run the migrations, then check the database manually to see if all email fields have been removed. If that is successful, then we monitor the game for a few days and see what happens as new users sign up and play. If no email fields are added, then I think this PR may not be necessary.

yup makes sense, am good with this too