Fix issues on ruby 1.9 due to lack of String#each

*_to_many associations can have singular values, indicating they
only have a single associated object, so work with both
single objects and arrays of objects correctly.

lib/fixture_dependencies.rb

@@ -190,8 +190,8 @@ def use(record, loading = [], procs = {})
             use(dep_name, loading, procs)
             value = get(dep_name)
           end
-        elsif
-          many_associations << [attr, reflection, model_method(:reflection_type, mtype, reflection) == :has_one ? [value] : value]
+        else
+          many_associations << [attr, reflection, value]
           next
         end
       end
@@ -213,7 +213,7 @@ def use(record, loading = [], procs = {})
     end
     # Update the has_many and habtm associations
     many_associations.each do |attr, reflection, values|
-      values.each do |value|
+      Array(values).each do |value|
         dep_name = "#{model_method(:reflection_class, mtype, reflection).name.underscore}__#{value}".to_sym
         rtype = model_method(:reflection_type, mtype, reflection) if verbose > 1
         if dep_name == record