Name spaced exceptions

I am catching a bunch of errors like this:

```
An Exception occurred in background at 2013-02-08 17:04:37 UTC :

400: There were errors in the operation
../bundle/ruby/1.9.1/gems/netdnarws-0.2.4/lib/netdnarws.rb:73:in `_response_as_json&#x27;
```

So in order to make this prettier and easier to debug, I implemented a way for you to namespace the exceptions.