Moving Along Integration with Asset Manager Module

I noticed the assetfield module was not yet fully integrated with the AM module and I made a couple changes to get it running. I suspect there can be some improvement here, but here is what i did so far.

1.) Defined the $asset_node->field_asset value that is needed later but not defined.
2.) Modified the theme functionname to be theme_assetfield_field instead of theme_assetfield