Merge pull request #4 from joshnuss/1-3-stable

Adds supper for Spree 1.3
Merge pull request #3 from ulices/feature_add_google_required_attributes

Feature: Add ability set a brand for products feed
Merge branch '1-3-stable' of https://github.com/ulices/spree-product-feed into 1-3-stable
added cdata tags for description and title xml
Merge branch '1-3-stable' of github.com:crowdint/spree-product-feed into 1-3-stable
Add google required attributes

- Brand, type, google product category, color and gender