Add conference singup page

Add a page with slug 'register' and parent 'conf'. Page resides at /conf/register.

![screen shot 2014-07-29 at 17 48 42](https://cloud.githubusercontent.com/assets/660805/3738379/3a615da6-1740-11e4-9ef2-2140a65c24f7.png)

@jospoortvliet @kelleybrooks