Use vsite_register's context-aware "Create a site" block, not new box #4663


#### Changes

* Move vsite_register's block into the correct region
* Add variables to configure "Create a site" block text
* Add contextual link to block display for sitewide admins
* Theme link nicely

#### Screenshot

![screen shot 2013-12-10 at 5 03 35 pm](https://f.cloud.github.com/assets/228733/1719125/6c42b48c-61e7-11e3-8bf1-cee34e1628e6.png)