Install phpunit 3.7.x, PHPUnit 4 doesn't work

PHPUnit 4 removes files that Cake uses. You must install 3.7 for everything to work.
[fr] Follow #1157

Removed TOC from controller/components section.
[fr] Follow #1155

Update auth.rst
Merge pull request #1158 from ckeboss/patch-1

Install phpunit 3.7.x, PHPUnit 4 doesn't work