Fixed bug with cucumber step definitions and humanized names; fixes

gh-48

features/factory_girl_steps.feature

@@ -93,6 +93,12 @@ Feature: Use step definitions generated by factories
       | name | admin |
       | John | true  |
 
+  Scenario: create a several instances of a factory with an underscore in its name 
+    Given 3 admin users exist
+    Then I should find the following for the last user:
+      | admin |
+      | true  |
+
   Scenario: use true values when creating instances
     Given the following user exists:
       | name | admin |

lib/factory_girl/step_definitions.rb

@@ -36,7 +36,7 @@ Factory.factories.values.each do |factory|
   end
 
   Given /^(\d+) #{factory.human_name}s exist$/ do |count|
-    count.to_i.times { Factory(factory.human_name) }
+    count.to_i.times { Factory(factory.factory_name) }
   end
 
   if factory.build_class.respond_to?(:columns)