fix todo and use similar pattern as for the rest of the parameters

Special case the 'aliases' and 'virtual' pillar entries

They must not be added as non-standard parameters, they constitute
data for other files.

Fixes #6.

Change states to use short-dec style

Allow inclusion of arbitrary parameters

Adds config state

extension of formula

extend template, shamelessly stolen from: http://russell.ballestrini.net/postfix-salt-state-formula/

Restructure according to new guidelines.