Add password reset request handling to the account page

As per [ECOM-347](https://openedx.atlassian.net/browse/ECOM-347). The next step in the password reset process (confirmation) is currently handled by student.views.password_reset_confirm_wrapper, a custom wrapper around Django's password reset confirmation view.

@wedaly and @stephensanchez, could you review this?
Please add the test as part of this PR.  We need to be able to trust that the test suite will catch regressions if we change the underlying implementation.