associate Task with User
define sale and product.

Task has some sale items.
And sale item has some products.
define sale and product.
add ignore directory:vendor/bundle/
Merge branch 'feature-material' into develop
fix .gitignore
remove scaffolds.css.scss.
Merge pull request #1 from codeenjin/develop

Merge pull request #1 into Develop
add migrate .rb
fix id naming.
fix id naming, flg naming.
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.