Fixed issue with hidden patterns not being able to be included.

Hidden patterns were registered with an underscore in the name.
I changed it to remove the underscore from the pattern name.

Author: kreativ-los

lib/engine_handlebars.js

@@ -45,6 +45,7 @@ var engine_handlebars = {
   },
 
   registerPartial: function (pattern) {
+    pattern.patternPartial = pattern.patternPartial.replace('-_', '-');
     Handlebars.registerPartial(pattern.patternPartial, pattern.template);
   },