Cleaned requirements.

--HG--
extra : histedit_source : f3c8dc8e322db6f6462b6750c76165b0ae8ec73c
Fixed `setuptools` package:
- Correct requirements.
- Correct script/entry-point.

--HG--
extra : histedit_source : 7d30d662af08614cd8c69961685e1eb2b37135b1
Added tag 0.3.0 for changeset bcbe934eab29
Specify package data in `setup.py`.
Better search preview.
Better output for `wk newuser`.
Better way to manage updating the wiki.

* Make the difference between updating just a single page, and updating the
  whole wiki.
* Properly resolve a just-updated page, but postpone resolving all the rest
  if we're using background updates.
* Don't flatten single metas for the web UI.