Add missing wget dependency to provision.py

We also explicitly include `ca-certificates`, as it is needed for the install
to complete. Usually this is brought in as a `Recommends` of `wget`, but some
systems may not automatically include such dependencies.

Fixes #470.

provision.py

@@ -36,6 +36,8 @@ APT_DEPENDENCIES = {
         "git",
         "npm",
         "yui-compressor",
+        "wget",
+        "ca-certificates",      # Explicit dependency in case e.g. wget is already installed
         "puppet",               # Used by lint-all
         "gettext",              # Used by makemessages i18n
     ]