2.0.0.0-dev85

* Service layer updates:
  * Implemented API for the CatalogInventory module
  * Refactored the external usages of the CatalogInventory module to service
* Fixed bugs:
  * Fixed an issue where a coupon usage option was not comprehensible enough
  * Fixed an issue where products selection for adding to a bundle option was lost when switching between pages with product grids
  * Fixed an issue where  Google Content was not sending the correct 'description' attribute
  * Fixed an issue where custom attributes were not displayed in layered navigation after a product import
  * Fixed an issue where the Category URL keys did not work correctly after saving
  * Fixed an issue where an admin could not create a Target rule with a certain Products to Display condition
  * Fixed a jQuery error on a product page in the Admin panel, which appeared when switching between product tabs
* Framework Improvements:
  * Created ProductsCustomOptions Service API for Catalog module
  * Created DownloadableLink Service API for Catalog module
* GitHub requests:
  * [#257] JSON loading should follow OWASP recommendation