Add Symfony2 coding style.

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
Update php-mode-modified for the new Symfony2 coding style
Document support for the Symfony2 style in the README
Merge branch 'md/symfony2-style'

* md/symfony2-style:
  Document support for the Symfony2 style in the README
  Update php-mode-modified for the new Symfony2 coding style
  Add Symfony2 coding style.