Basic stores index
Stores#show no longer redirects

The url will remain /stores/:code
The home button on the header will now lead to the current store's homepage.
Altered logo helper and added store_home_path
Altered logo helper and added store_home_path
(cherry picked from commit 482e932)
Stores#show is now supposedly fully functional
Adjusted for supporting subdomains (substore.domain.com)
Change non-admin resources routes to explicit routes
Add parent_id to Store model, with some tree functions
Break stores/show to start working on store mixing
Added proxy object to fuse multiple stores
Spree::Store.with_code isn't useful; I'll remove it later
StoresController#show now correctly fuses stores and redirects if necessary
Altered helpers and decorators to accommodate for mixed stores
All store-mixing functionality is good to go except order checking
Url order checking is go!