Done shop settings except pickup location.
Done pickup location.
Fixed issues #34,35,36,37,38
Merge branch 't4-shop-settings'

Merge
Merged branch 'buyer' into master.
Done migration to create categories. Dump countries and states data into countries_states.json.
refs None, fixed bug on description is not saved.
Buyer browse buy market view.
Done markets, market view. TODO: market image, reviews
Added migrations to load dummy locations.
Added pickup_days and start time, end time for provider's site.
Done store details view.
Done migration to create categories. Dump countries and states data into countries_states.json.
resolve merge confilt t14-browse-market.
Moved DAYS dictionary to user_tags.py. Added shopping cart app.
Added shopping cart model, views
Added basic shopping cart functions.
Updated add to cart link in product/services page.
Changed logotype, updated dashborad links.
Done order models, buyer order views.