Re #54: Add Army support to WarFoundryFactory * Stop "custom equipment" node being mandatory * Remove unused "ratio" definition * Change "integer or ratio" definition to "integer or percentage" * Use "integer or percentage" definition in army XSD * Add exception to say that required objects were missing (Game System and Race) * Throw exceptions on creating army if game system or race is missing Re #53: Add saving of Army to XML file * Add namespace attributes to XML root node