Provide for alternative settings #111

You can specify the response format (json, xml, etc), but you can't specify other OverpassQL settings like maxsize and global boundingbox. If would be nice if there were a way to add those to the constructed query.

If you can share the specific settings you want to override and an example usage, that will help us scope this for 0.8.

In 1.0, we will introduce flexible QuerySettings(output, timeout, maxsize, date) that compile to [out:...][timeout:...][maxsize:...][date:"..."];.