migrate fixtures to git links (jsok#120)

this will pull in fixtures from the master branch and not from the
latest release. This has two benefits. a) getting fixtures is faster. b)
you can test against breaking changes in dependencies before they are
released. This is the current best practice in the Puppet Community.

.fixtures.yml

@@ -1,8 +1,8 @@
 fixtures:
-  forge_modules:
-    stdlib: "puppetlabs/stdlib"
-    archive: "puppet/archive"
-    systemd: "camptocamp/systemd"
-    file_capability: "stm/file_capability"
+  repositories:
+    stdlib: "git://github.com/puppetlabs/puppetlabs-stdlib.git"
+    archive: "git://github.com/voxpupuli/puppet-archive.git"
+    systemd: "git://github.com/camptocamp/puppet-systemd.git"
+    file_capability: "git://github.com/smoeding/puppet-file_capability.git"
   symlinks:
     vault: "#{source_dir}"