correctly show contributors

Created by: mbonani

As the project becomes bigger with several programs and tools (different clients, plugins) it becomes difficult to correctly make an authors pages. It is also perhaps to general and its is difficult to show in what the contributors really worked on. I open this issue to get your opinion on that. Should we multiply authors.txt or authors.md in the several client, plugins, switches to correctly keep trace? Should we have a definite header in each file with rules to keep them update (a merge is only accept if header is update)? Should we have something else ?