Allow passwordless registration

[joshuachinemezu]

Solves #76

This allows for passwordless registration - See #76 for discussion

Keynotes:

• Django's set_unusable_password() is used to set the default password.
• A set password email is sent to the user after registration, this email has a token that is used in setting the password
• The user can only set their password once; this check is done with Django's has_usable_password()
• The user is verified immediately they set a password.
• The user needs to set a password before they can log in successfully

I've just added the following configuration keys:

Key	Description	Default
ALLOW_PASSWORDLESS_REGISTRATION	Used for enabling passwordless registration	False Boolean
SEND_PASSWORD_SET_EMAIL	If set to True, user will be notified to set their password after registration - dependent on ALLOW_PASSWORDLESS_REGISTRATION	False Boolean
PASSWORD_SET_PATH_ON_EMAIL	Path variable used in password set email	password-set String
EXPIRATION_PASSWORD_SET_TOKEN	Time for set password token to expire	timedelta(hours=1) datetime
EMAIL_SUBJECT_PASSWORD_SET	Email subject of set password	email/password_set_subject.txt String
EMAIL_TEMPLATE_PASSWORD_SET	Email template for set password	email/password_set_email.html String

[codecov-io]

Codecov Report

Merging #77 into master will decrease coverage by 2.20%. The diff coverage is 68.96%.

@@            Coverage Diff             @@
##           master      #77      +/-   ##
==========================================
- Coverage   94.72%   92.52%   -2.21%     
==========================================
  Files          11       11              
  Lines         626      682      +56     
==========================================
+ Hits          593      631      +38     
- Misses         33       51      +18     

Impacted Files	Coverage Δ
graphql_auth/forms.py	75.00% <42.85%> (-25.00%)	:arrow_down:
graphql_auth/mixins.py	90.40% <68.75%> (-2.44%)	:arrow_down:
graphql_auth/constants.py	100.00% <100.00%> (ø)
graphql_auth/exceptions.py	100.00% <100.00%> (ø)
graphql_auth/mutations.py	100.00% <100.00%> (ø)
graphql_auth/relay.py	100.00% <100.00%> (ø)

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