Tenant landing pages

Allows the UI to retrieve configurable information to put on the tenant landing pages
We need to incorporate the default OAE landing page values in here, so we get the desired landing page configuration when creating a new tenant. I don't think the UI should be setting that default. Note that the default text can just use the i18n keys.

![screen shot 2014-11-19 at 15 41 12](https://cloud.githubusercontent.com/assets/109850/5108461/6b0f3750-7002-11e4-9946-e19089c78975.png)
![screen shot 2014-11-19 at 15 41 46](https://cloud.githubusercontent.com/assets/109850/5108463/6b2fbe44-7002-11e4-90f6-a30654de7be8.png)
![screen shot 2014-11-19 at 15 41 57](https://cloud.githubusercontent.com/assets/109850/5108462/6b2de9fc-7002-11e4-9606-a1ed03ba0fae.png)