Rails 3.0 support

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Based on http://guides.rails.info/3_0_release_notes.html

  1. script/* replaced by script/rails
  2. new generators list format
  3. new rspec generators names
  4. quick generate popup (similar to popup for rake)
  5. config.gem replaced by gemfile and bundler (>= 0.9)
  6. rails upgrade plugin support
  7. improved autoload syntax
  8. i18n
    1. ActiveModel::Translations support
    2. default translations for attributes
    3. labels i18n
  9. support additional app generation parameters
  10. Controllers
    1. new render extensions
    2. mail and actionmailer gem support
  11. Routing (http://rizwanreza.com/2009/12/20/revamped-routes-in-rails-3)
    1. scope - namespacing routes for different actions/languages
    2. match - rack application
    3. inspection for old map method (to be removed in 3.1)
  12. Models
    1. new validations syntax (http://thelucid.com/2010/01/08/sexy-validation-in-edge-rails-rails-3/, http://lindsaar.net/2010/1/31/validates_rails_3_awesome_is_true)
    2. new query syntax (http://m.onkey.org/2010/1/22/active-record-query-interface)
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