Fix unicode.
Add simple browser view for ech0039.

Currently returns a zipfile with dummy content.
WIP: export folderish and contentish content.

Only exports very basic set of attribues.
Warning: currently not in a working state for contentish
content.
Add debug functionality for pyxb.
Add more example data.
Improve debug output.
Implement export.

Create zipfile during export and xml generation.
Add documents to zipfile.