Merge pull request #1 from codeenjin/develop

Merge pull request #1 into Develop
Merge pull request #2 from codeenjin/develop

add migrate .rb
Merge branch 'develop' into feature/nakao
scaffold SaleProduct and define relation.
Merge branch 'feature/add-SaleProduct' into develop
define relation and apply bootstrap.
Merge pull request #3 from aratana/feature/define-relation

define relation and apply bootstrap.
temporary routing
register and display product
tuuning product index view.
scaffold Price
relation price to sale.
routing to price index
optimize routing.
optimize constant accesse.
optimize create display object logic.
revise form for.
rivision
Merge pull request #4 from aratana/feature/tuuning-visible

Feature/tuuning visible
delete price property from Sale.