Added plugins for additional property handling for orders
Merge https://github.com/Arcavias/arcavias-core into 2013-01-25_property_plugins
Adjusted PropertyAdd plugin to handle the new type column
Added documentation for PropertyAdd plugin functions
Corrections and improvements on Property*-Plugins
Merge pull request #43 from jevers/2013-01-25_property_plugins

Adds plugins for checking and adding properties when products are added to the basket