add __postgres_extension type

cdist/conf/type/__postgres_extension/gencode-remote

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+#!/bin/sh
+#
+# 2011 Steven Armstrong (steven-cdist at armstrong.cc)
+# 2013 Tomas Pospisek (tpo_deb at sourcepole.ch)
+#
+# This type was created by Tomas Pospisek based on the
+#__postgres_role type by Steven Armstrong
+#
+# 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/>.
+#
+
+dbname=$(    echo "$__object_id" | cut -d":" -f1 )
+extension=$( echo "$__object_id" | cut -d":" -f2 )
+
+state_should=$( cat "$__object/parameter/state" )
+
+case "$state_should" in
+    present)
+         cmd="CREATE EXTENSION IF NOT EXISTS $extension"
+         echo "su - postgres -c 'psql -c \"$cmd\" \"$dbname\"'"
+    ;;
+    absent)
+         cmd="DROP   EXTENSION IF     EXISTS $extenstion"
+         echo "su - postgres -c 'psql -c \"$cmd\" \"$dbname\"'"
+    ;;
+esac

cdist/conf/type/__postgres_extension/man.text

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+cdist-type__postgres_extension(7)
+=================================
+Tomas Pospisek <tpo_deb--@--sourcepole.ch>
+
+
+NAME
+----
+cdist-type__postgres_extension - manage postgres extensions
+
+
+DESCRIPTION
+-----------
+This cdist type allows you to create or drop postgres extensions.
+
+The object you need to pass to __postgres_extension consists of
+the database name and the extension name joined by a colon in the
+following form:
+
+    dbname:extension
+
+f.ex.
+
+    rails_test:unaccent
+
+
+OPTIONAL PARAMETERS
+-------------------
+state::
+    Either "present" or "absent", defaults to "present"
+
+
+EXAMPLES
+--------
+
+--------------------------------------------------------------------------------
+__postgres_extension           rails_test:unaccent
+__postgres_extension --present rails_test:unaccent
+__postgres_extension --absent  rails_test:unaccent
+--------------------------------------------------------------------------------
+
+
+SEE ALSO
+--------
+- cdist-type(7)
+- cdist-type__postgres_database(7)
+- http://www.postgresql.org/docs/current/static/sql-createextension.html
+
+
+COPYING
+-------
+Copyright \(C) 2014 Tomas Pospisek. Free use of this software is
+granted under the terms of the GNU General Public License version 3 (GPLv3).

cdist/conf/type/__postgres_extension/parameter/default/state

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+present

cdist/conf/type/__postgres_extension/parameter/optional

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+state