Provide MDUI info to Velocity templates

This provides the <mdui> information and the entityID from the SP's metadata to the Velocity templates so that Velocity templates have the same UI elements available to them that the JSP stuff does currently.  New objects available to the templates include

```
$UILogo -- either puts out a <img> tag or has getters for the various parts of a tag
$UIDescription -- Service description
$UIName -- Service name
$UIPrivacyURL -- Privacy URL
$UIInfoURL -- Information URL
$UIEntityID -- The entityID of the service provider
```