Update phpunit to 4.6.2
Update phpunit to 4.6.2

Closes #1647.

Signed-off-by: Alan Ivey <ee249fd9166eccef852f50ca0cbb6ff8665afe99@gmail.com>

mkalkbrenner/homebrew-php,philcook/homebrew-php,dguyon/homebrew-php,ablyler/homebrew-php,TomK/homebrew-php