IPNS support and release bugfix

It now supports IPNS, prefix your root cid configuration with '/ipns/...' to have it resolve (closes #5 ) and a bugfix in setting the version during make build now gives the addon.xml a proper version (closes #4 ).

What's Changed

• Add error notification by @bneijt in #3
• Minor changes by @bneijt in #6
• Issue 5 by @bneijt in #7

Full Changelog: 0.0.6...0.0.7