showing org information with zone information on registration page.

Previously, during web-based registration, zones were listed without organization information.
* Now, if there's more than one organization, the org info is shown along with the zone info.
* In addition, the zones are now sorted by name.
* Finally, if you have no zones, one will be created for you (previously, users were left hung out to dry--no instructions, no way to create)

Testing:
* Tested with all relevant scenarios (1 organization/zone, multiple organizations/zones, no organization/zone)

Just one organization:
![image](https://f.cloud.github.com/assets/4072455/1144573/e11715cc-1daa-11e3-966f-dc17345618c6.png)

Multiple organizations:
![image](https://f.cloud.github.com/assets/4072455/1144559/38db6d50-1da9-11e3-9bb7-dd5f3d43a99f.png)

No zones:
![image](https://f.cloud.github.com/assets/4072455/1144589/6adffb64-1dad-11e3-9672-eaa31ceb99e6.png)