return the word if no replacement rule fits

lib/inflection/inflection.js

@@ -177,7 +177,6 @@ exports.singularize = function (word) {
             return word;
         }
     }
-    
     for (var i = 0; i < SINGULARS.length; i++) {
         var rule = SINGULARS[i][0],
             replacement = SINGULARS[i][1];        
@@ -185,6 +184,7 @@ exports.singularize = function (word) {
             return word.replace(rule, replacement);
         }
     }
+    return word
 }
 
 /**