Update links after ownership transfer

Attester now has its own organization, not anymore part of ariatemplates
Expose main module script

To use attester as a module it's necessary to specify a `main` file in the package.json
Use xml2js instead of xml2json (test dependency).

This removes dependencies on external compilation tools.
xml2js is written in pure JavaScript whereas xml2json
relies on node-expat which is a native module requiring
compilation.
Fix missing test name when reporting some errors on the console.
Option to not shut down on campaign end

Adds possibility to not shut down the server once campaign ends.
Useful for debugging.

Close #15. Close #54.
Optional predictable campaign URLs