Working and specced supplier signup

spec/acceptance/suppliers/settings.feature

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+Feature: Manage settings
+  Scenario: Changing the supplier email

spec/acceptance/suppliers/signup.feature

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+Feature: A supplier can sign up
+  Scenario: It works
+    When I visit the supplier signup path
+    And fill in the supplier signup form with new credentials
+    And click on the supplier signup submit button
+    Then a new unconfirmed supplier with the new signup credentials should be created
+    And a supplier signup confirmation mail should be sent containing a link to the token
+    When I visit the supplier signup confirmation path with the correct token
+    Then the new signup supplier should be confirmed
+    And I should be redirected to the supplier settings page
+