Squashed commit of the following:

Squashed commit of the following:

commit 90620124a20d8c9da19b26920b02b521766c42e4
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 16:50:05 2012 -0400

    Add a checkbox to hide OpenID links

commit 47a4a5824208868bd5f4f163456f8e08380e5f36
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 16:35:15 2012 -0400

    Don't show the profile links if the hide_profile_link flag is set

commit eafd4b8ba1f7c06c92e5279b1a703c5534aa7255
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 16:30:23 2012 -0400

    class for user_openid_prefs table

commit 60e3e3825b20745c08b4d30dbbcac2d7ce604a2f
Author: Evan Prodromou <evan@status.net>
Date:   Mon Jul 9 16:29:15 2012 -0400

    add User_openid_prefs table and class