Upgrade to http 2.1.4 to fix failing build with curl 7.39
Update repository address and bump version for Twig extension
php53-twig: add 1.16.2 bottle.
php54-twig: add 1.16.2 bottle.
php55-twig: add 1.16.2 bottle.
php56-twig: add 1.16.2 bottle.