Check for logged in state being dynamically loaded

Some sites will add in the HTML that we are checking against via javascript.  Waltz should recheck to see if we're logged in for some period.  If we are, dismiss the waltz widget.

An unfortunate side-effect of this is that if you're logged in and the check doesn't immediately pass, we drop down the incorrect credentials window.  If Waltz notices the login later I've set it to automatically dismiss the form, but it still feels pretty awful.  @jessepollak @landakram thoughts?