Implemented image importing, cleaning up text body import

- Implemented basic image uploading (WP Captions not supported yet)
- cleaned up text that was being imported -- WP exports use Unix line breaks which weren't coming through clearly in the XML resulting in one big, continuous block of text for the post with no line breaks.  

It's no where ideal yet, but it's a step forward.  Still have to find a way to suitably filter out &not; and &dagger; characters showing up in some posts.