Upgrade to Rails 3.2.9

Gemfile
- Upgrade to Rails 3.2.9 from 3.0.1.
  (Overwrite with Gemfile from project SOJIN.)
config/environments/development.rb
- Remove config.action_view.debug_rjs for Rails 3.2.
Alter config/database.yml to use PostgreSQL

config/database.yml
- Alter to use PostgreSQL.