Standardized logging

spritesheet.lua

@@ -15,6 +15,8 @@
 
 local _VERSION = '0.1.5'
 
+local logger = require 'log' 'spritesheet'
+
 local error_original = error
 local error, error_internal do
     error, error_internal  =  error_original, error_original
@@ -342,7 +344,7 @@ local function load_quad_data (filename)
             end
             return data
         end
-        print(error_msg)
+        logger:debug('Failed to load %s: %s', filetype, error_msg)
     end
 
     -- Else, give up.