Revert "install rubygems for ubuntu/debian"

On request by Steven.

This reverts commit d2c45717f1.

cdist/conf/type/__package_rubygem/manifest

@@ -1,33 +0,0 @@
-#!/bin/sh
-#
-# 2014 Steven Armstrong (steven-cdist at armstrong.cc)
-#
-# This file is part of cdist.
-#
-# cdist is free software: you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
-#
-# cdist is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with cdist. If not, see <http://www.gnu.org/licenses/>.
-#
-
-
-os=$(cat "$__global/explorer/os")
-
-case "$os" in
-   debian|ubuntu)
-      __package rubygems
-   ;;
-   *)
-      echo "Your operating system ($os) is currently not supported by this type (${__type##*/})." >&2
-      echo "Please contribute an implementation for it if you can." >&2
-      exit 1
-   ;;
-esac