Changed inline style of review list.
Added a very simple view.
Added URL redirection.

Redirect the request url began with '^gem_store/' to URLconf module `gem_store.urls`
Two views added.
Added two url mappings to urlpatterns.

Two different view expressions were used. One is module representation, the other is in string fmt to represent the absolute path.
Display top five rarity products in the product index page.