GH#452: Make a complete authors section on Dancer2:

Pau Amma fixed the list of complete authors by:

- Removing the list from AUTHORS file, and inserting a line saying
  you should look for the stuff in the POD instead.

- Creating a new list from fresh Git commits.

- Adding the list in the POD, sorting by alphabetical order, updating
  each section properly.
reflect changes
Merge branch 'docs/authors-contributors-cleanup'