BrowserID support

[Christopher Allan Webber]

Talked to the openphoto people. They have browserid support, which
looks easy and pleasant:
`https://browserid.org/ <https://browserid.org/>`_

Furthermore, the OpenPhoto people say it's easy. So why not support
it? :)

::

    <paroneayea> hub: we don't use browserid yet
    <paroneayea> but I'd like to
    <jmathai> paroneayea: said there's a json spec but it's not finalized yet
    <paroneayea> how hard is browserid to implement?
    <paroneayea> it looks beautifully pleasant to use
    <jmathai> trivial
    <paroneayea> really?
    <paroneayea> awesome