For all Joomla 3+ templates built using the Zen Grid Framework v4 (any theme after October 2014) please refer to the Zen Grid Framework v4 documentation.
Overview
Logo file folder
Joomla 2.5 changed functionality so logo has to be placed inside Joomla folder/images or its subfolder! There is no more possibility to place logo inside template folder and select this logo image inside template setting->Appereance->Logo.