Finish Sxn 9.2.1: One error in authentication spec

1.  Added test to authentication_pages_spec to describe submitting to the update action
    Test is presently failing due to undefined method for "patch".  This appears to be
    an issue with Capybara >2.0.  Have question on Stack Overflow to try and figure it
    out.
2.  All other tests passing green, committing and will come back to this one.