Moved WWW UI dist data into library

Moved authors, version, URL and so on from setup.py into the library to
prepare for presenting version information in the WWW UI.

Part of #339
Display WWW UI version in bottom-left corner

The version of the WWW UI is now always displayed in the bottom-left
corner of the page.

Part of #339
Added a 'version'-controller to WWW UI

The NIPAP web UI now sports a version controller, accessible at the path
'/version', where the nipap-www and pynipap versions are shown. I also
renamed the template context variable used to store UUU UI version from
'version' to 'www_version' to accomodate other versions.

Part of #339
Merge branch 'www_ui_version'

Part of #339