Fixes #23: Composer won't update in Vagrant

The php5-intl extension was a missing dependency; which caused the
Vagrant install command to fail. By adding it to the provisioning
script this will install it and composer runs as expected.
Merge pull request #26 from mvriel/features/23

Fixes #23: Composer won't update in Vagrant
Merge branch 'master' of github.com:Ingewikkeld/Resourceful into features/24

Conflicts:
	puppet/modules/symfony-rest/manifests/init.pp