Info improvements

Improves the styling of the data source info panel.  Also adds Data Custodian information, which works as follows:
* If `init_nm.json` for the data source has a `dataCustodian` property, that property is formatted and displayed exactly as is the `description` property.  That is, use Markdown-style links (`[Link Text](http://link.url)`) and `<br/>` for line breaks.
* If no `dataCustodian` is specified, the custodian text is created from the WMS `GetCapabilities` `ContactInformation` properties.  Specifically:

```
[ContactPersonPrimary.ContactPerson]
[ContactPersonPrimary.ContactOrganization]
[ContactElectronicMailAddress]
[ContactVoiceTelephone]
```

If any field is missing or has no value, it is omitted.

Fixes #321

@kgrochow, can you go through the standard data sources and add the `dataCustodian` field, since you hopefully know better where the data sources came from?

![image](https://cloud.githubusercontent.com/assets/924374/4267533/78d7af1c-3c9e-11e4-9710-f550ee47c516.png)