update rake task seed to reflect products renamed attribute asin
Established self joining relationship between products and similar products in the database
  - Created table of similars for relationship between product and similarprod
tested similarprod relationship
Renamed column sim_products to asins_of_sim_prods to more easily differentiate from simprods relationship and array of asins stored in product table
fixed merge conflicts
Update product lookup module for new attribute name
Merge pull request #16 from ShopIt2Me/sim-prod-rltnshp

Sim prod rltnshp
Add ProductPrioritySet next_batch test. NOTE: gives deprecation warning for #count method
Merge master branch with current branch
* Updated labeling of sim_products to correct asins_of_sim_prods to match model
* Add persist_products test for ProductPrioritySet module