add doc about manifests and environment

Signed-off-by: Nico Schottelius <nico@kr.ethz.ch>

doc/man/cdist-environment.text

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+cdist-environment(7)
+====================
+Nico Schottelius <nico-cdist--@--schottelius.org>
+
+
+NAME
+----
+cdist-environment - Which environment cdist sets up
+
+
+DESCRIPTION
+-----------
+
+PREFIXES
+--------
+
+These prefixes are supposed to be used. If you write a new type, you
+should stick to these conventions.
+
+- __: All variables setup by cdist are prefixed with a double _
+- __core: Variables setup by the cdist core
+- __<type>_<name>: Variable <name> setup by type <type>
+
+
+EXAPMLES
+--------
+
+
+COPYING
+-------
+Copyright \(C) 2010 Nico Schottelius. Free use of this software is
+granted under the terms of the GNU General Public License version 3 (GPLv3).

doc/man/cdist-manifests.text

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+cdist-manifests(7)
+==================
+Nico Schottelius <nico-cdist--@--schottelius.org>
+
+
+NAME
+----
+cdist-manifests - Map configuration to hosts
+
+
+DESCRIPTION
+-----------
+Using the available types and shell language, you can create mappings of what
+should be configured on a host.
+
+
+
+ENVIRONMENT
+-----------
+The following variables are available in manifests:
+
+- __{explorer|fact}_{name}
+- __core_hostname: Hostname that we are deploying to
+- __core_localhostname: Hostname that we are deploying from
+
+EXAPMLES
+--------
+
+
+COPYING
+-------
+Copyright \(C) 2010 Nico Schottelius. Free use of this software is
+granted under the terms of the GNU General Public License version 3 (GPLv3).