formatting logs for structured data

If the state of a log message is an `ILoggerStructure`, the console logger will display the result of `GetValues`, one `KeyValuePair` per line. It does this recursively for cases where the  `Value` is an `ILoggerStructure` or an `IEnumerable<ILoggerStructure>` 

![consolestructuredoutput](https://cloud.githubusercontent.com/assets/2818455/5152093/8aff8496-719e-11e4-9bde-8f3836827219.png)

Tabs might be overkill, especially if you end up with a deeply nested object. How does it look with just two or three spaces?