Symfony 3.0 compatibility

UPGRADE FROM 1.x to 2.0

Dependencies

• The hostnet/form-twig-bridge depends on Symfony 3.
• PHP requirement has been set on >=5.6 (older versions might work, but we did not verify)

PHPRenderer

• Renamed PHPRenderer to PhpRenderer
• Removed renderEnctype
• Added renderStart and renderEnd methods

Symfony 2.6 and higher compatibility release

Merge pull request #7 from iltar/master

Fixed dependencies

1.0.4

Released to have the ability to upgrade packages to use sf2.5