[Rails upgrade] Upgrade to Rails 3.2.18

  - Setup the application to skip controller assets and helpers
    generation.
  - Setup the application to skip controller specs generation.
  - Refactor Gemfile.
  - Add database.yml sample file.
  - Add new README file.
  - Add db/schema.rb file.
  - Add .ruby-version and .ruby-gemset files.
Merge pull request #200 from insignia4u/rails-upgrade

[Rails upgrade] Upgrade to Rails 3.2.18

  - Setup the application to skip controller assets and helpers
    generation.
  - Setup the application to skip controller specs generation.
  - Refactor Gemfile.
  - Add database.yml sample file.
  - Add new README file.
  - Add db/schema.rb file.
  - Add .ruby-version and .ruby-gemset files.