A first step towards theme debugging

issue #2204
- allow handlebars log helper to output to console in dev mode

core/server/helpers/index.js

@@ -34,6 +34,10 @@ var downsize        = require('downsize'),
         ]
     };
 
+if (!isProduction) {
+    hbs.handlebars.logger.level = 0;
+}
+
 /**
  * [ description]
  * @todo ghost core helpers + a way for themes to register them