2.1.5

Release Notes:

• Fix hidden exception on feed save.
• Inherit title from parent setting under Configurable and Grouped products does not work.
• Allow spaces in feed columns, required for local inventory feeds: https://support.google.com/merchants/answer/3061342
• Attempt to fix FK constraint table errors. 
• Fix categories from other stores output in "Product Type by Magento Category" directive.
• Fix schedule not been processed - date format.