Twenty Fourteen: wp-activate.php and wp-signup.php

[ocean90]

Both pages need some love.

[cuvelier]

This ticket relies on #25478 being merged so we can target the pages separately in the css.

[lancewillett]

@obenland said a volunteer from WCEU is working on this, patch to come soon.

[lancewillett]

Still waiting on the 3.8 fix.

[lancewillett]

@obenland made a good point in IRC discussion, that since we need to support older versions (without the new class values) we don't really need to wait for that change.

[lancewillett]

In 26133:

Twenty Fourteen: style multisite pages wp-activate.php and wp-signup.php, props obenland. Fixes #25479.