Merge pull request #20 from kgmx/use_PostgreSQL

Use PostgreSQL
Fix spelling
Create simple_form.ja.yml
Edit application.html.haml
Update views/collection
Create _simple_form.css.scss
Update buttons.css.scss for cancel-button
Update css/collection
Update views/item
Update css/item
Merge pull request #34 from kgmx/add_css_to_simple_form

Add css to simple form