Fix reserved ns prefix

[joewiz]

• Closes #2
• Improve build tasks
• Port release notes from 0.4 release (which hadn't been reflected in source control)
• Update release notes with recent additions
• Bump to 0.5, prepare for release

[joewiz]

If merged:

• [x] Build, upload release to public-repo (and regenerate package list)

[joewiz]

Thanks for the merge & upload, Wolfgang!