Product show page UI changes to group cat3 and cat1 tests, and organize all tests better

More well-formed tables (moved tbody to the outside of the results loop)

Merged changes from master into test list UI changes

Added tests_by_cat3 to product.rb, timestamps to some models, and a default timezone to development.rb

Added default time zone to production.rb

Added fallback for if the test does not have a created_at attribute

Removed reference to StaticCVProductTest