Change lookup value to dynamic value

[martirella]

Problem

This package is limited to recovering passwords by email

Solution

Make the lookup field dynamic so it can be used for any field.

Example

You want to recover a user by username,

1. You set up the settings to DJANGO_REST_LOOKUP_FIELD= 'username'.

2. When calling the API, the request body should be

{
  "username": "mycoolusername"
}

As a result, on the ResetPasswordRequestToken view the query will be username__iexact="mycoolusername".

[anx-cbenke]

Universal approach to a user-defined lookup-field makes a lot of sense. I only ask you to explicate that it's not limited to email in the docs (Just insert a generic term instead of "custom_email_field", see the comment below)

Please also pull the recent changes from master and resolve the conflict in django_rest_passwordreset/views.py.

[anx-cbenke]

The heading is no longer correct when the lookup-field can be anything, not only email.

'custom_email_field' should be changed to a more generic value too, to make clear that the lookup-field is not limited to an email-adress