Added release notes of 0.5.4
Updated setup.py for iPOPO 0.5.4

- Corrected download link
- Development status changes from alpha to beta
- Added Python 3.x classifiers
Updated bundle versions

Version minor increased for all modified bundles
Static site: updated version number
Static site: Link to the wiki now in the template

The link to the wiki is now visible on the top of all pages.