Make the formula fully pillar driven/customizable

- split package and param into separate state files
- use defaults.yml to specify all configurable options of the formula
- setup map.jinja to read in defaults.yml, filter by os_family for
  Arch, and merge in sysctl:lookup pillar
- Updated README

sysctl/param.sls

@@ -0,0 +1,17 @@
+# -*- coding: utf-8 -*-
+# vim: ft=sls
+
+{## import settings from map.jinja ##}
+{% from "sysctl/map.jinja" import sysctl_settings with context %}
+
+{% for param in  sysctl_settings.get('params', {}) %}
+  {% if param is mapping %}
+sysctl-present-{{ param.name }}:
+  sysctl.present:
+    - name: {{ param.name }}
+    - value: {{ param.version }}
+    {% if param.config is defined %}
+    - config: {{ sysctl_settings.config.location }}/{{ param.config }}
+    {% endif %}
+  {% endif %}
+{% endfor %}