Fix namespaced locals

If locals has a namespace, name of resource return something like "spree/parser/conflict" and then it convert to sym :"spree/parser/conflict", so in `partial.rb` in `render` method locals will be like this `#=> :"spree/parser/conflict"` so render method read it uncorrectily and cause errors like `undefined local variable or method `parser' for #<#<Class:0x007f87e55154e0>:0x007f87e34b7ab8>`. This pull request take only class name from model_name and there is no errors for now.