added year_payed field to users model
added *.idea to .gitignore
removed migration and year_payed field
added Payment model and removed amount_payed field from User
changed signal to use Payment as sender
added created_at field
did a few changes on the check_payment_amount signal
fixed AUTH_USER_MODEL issue
removed amount_payed from user admin
fixed Payment model and added migrations
added validators
fixed queryset in DirectiveView
fixed settings linked in template
changed AECC_UPRB_MEMBER_FEE to use env value
added has_valid_membership method to user
Merge pull request #60 from AECC-UPRB/users-yearly-payment