Change how feed parser does normalization

[jfroelich]

I think normalization should be more explicit. feed parser should produce a raw object with very specific fields. then, a normalization step can produce another object where fields have been merged together into a normalized feed object.

this way, i can more easily do things like inspect why a feed is behaving funny, because i can inspect its state prior to normalization.

[jfroelich]

There is no point to extravagant designs and features if there is no obvious use. There is no obvious use here.