Product JSON api rendering speed optimization

Before (dev machine - 650 products):
Completed 200 OK in 6768ms (Views: 1408.6ms | ActiveRecord: 5192.0ms)

After:
Completed 200 OK in 660ms (Views: 156.2ms | ActiveRecord: 63.5ms)
Fix tests
Merge pull request #46 from standout/de-dont-limit-products

Product JSON api rendering speed optimization