Cleanup make helpers

I was under the false impression that $(makefiledir) helper works.
It seems like the mission to get the directory in which the current
Makefile lives is impossible, so I will just go with hardcoding those
paths. How bad can it be?
make tidy: only run when necessary
make default task is test
Registration form directive: pass the DOM form element to the form controller
Registration form directive: focus the email field

Not using autofocus attribute on the field because Angular doesn’t sense
the focus change and doesn’t update ng-if’s in the directive scope.
RegistrationFormController: fix typo in emailFieldFocused()
make html: remove a forgotten debug message
RegistrationFromController.emailCorrect(): returns true for emty values

It is used in a way that makes that a concern of
RegistrationFromController#emailEntered() function.
Registration form: validation error messages