Request / reset PIN for proxy or paid accounts

[cbeer]

Follow-on to #12.

If the user needs to reset (or set?) their PIN for some reason, they will provide their library ID number. We can use the user/patron/resetMyPin API to trigger a reset workflow.

Q: Presumably only non-webauthID users can reset their PINs?
Q: The API docs suggest that the email address might be required to have Symphony send out the email?
Q: Is the result of resetMyPin a new PIN, or a link into Symphony to reset the PIN (and, do we want to handle that in MyAccount?)

Links

From the home page

From the login page

Form:

Flash message

After making the symphony API request (regardless of success/failure, assuming e.g. Symphony cares whether the user exists or not)

[mejackreed]

@camillevilla @jvine while implementing this, we discovered that we need to provide a reset link that will be emailed out to end users. For now we can't figure out how that URL is crafted in current myaccount. That being said, we will likely need to implement a "Change my PIN" page in MyLibrary that uses the reset token emailed and /user/patron/changeMyPin to update the user's pin. Split out to #149