Seed, look related changes:

* Changed seeding code so that it does not result in 'stack level too deep'
  error. Added a :db_seeding attribute in the items model which is used to
  conditionally validate_associated. validate_associated was causing the
  seeding error
* Added breadcrumbs for better navigation
* Added item listing in shop, and inidividual item display changes
Formatting changes.
Added pagination with kaminari. Other format changes
Merge pull request #3 from asolkar/function

Pagination and other formatting changes