initial BasicAuthExhibitorRestClient 

that can also skip ssl cert validation if required

Also might be nice to provide a convenience method in ExhibitorEnsembleProvider, something like

```java
pubic static ExhibitorEnsembleProvider fromURL(URL vip, boolean validateSsl)
```

which would create the `Exhibitors` from the hostname, extract the userInfo, port and path from the url
You can use Guava's CharStreams here. It would be cleaner:

```java
Reader in = new InputStreamReader(new BufferedInputStream(connection.getInputStream()));
try
{
    return CharStreams.toString(in);
}
finally
{
    CloseableUtils.closeQuietly(in);
}
```