Fix conflicting ids in admin/orders/_form.html.erb

Fixes #2976
Specify class name for calculator association in calculated_adjustment

Otherwise, top-level classes that include this module will have an association that looks for ::Calculator, rather than Spree::Calculator
Fix variant thumbnails not showing on frontend

The thumbnails for variant would not show on variant click. And the
product page opened without any visible thumbnails.

Fixes #3130

Conflicts:
	core/app/assets/javascripts/store/product.js.coffee
	core/app/views/spree/products/_thumbnails.html.erb
Disable Jirafe
Remove dash gem
Remove overview tab until Jirafe issues are sorted.
Remove dash stuff from Rake
Bump to 1.3.3
Merge github/1-3-stable