Make note of Apache configuration for Authorization in the docs

[storeman]

I was struggling for multiple hours with the Basic Authorization which was perfectly working locally, but not in production. Found a that the solution was very simple, but hard to find:

http://briangallagher.ie/2015/01/26/apigility-constant-403-forbidden/

[weierophinney]

This repository has been closed and moved to laminas-api-tools/api-tools; a new issue has been opened at laminas-api-tools/api-tools#13.