Use m/d/Y date format in admin views

Signed-off-by: Max Fierke <max@maxfierke.com>
Fix issue where current date would be shown if date field was empty

Signed-off-by: Max Fierke <max@maxfierke.com>
Fix indentation in some form types

Signed-off-by: Max Fierke <max@maxfierke.com>
Use stable version of sonata admin bundle and doctrine companion

Signed-off-by: Max Fierke <max@maxfierke.com>