Added s3 feature, renamed the basic feature

features/s3.feature

+Feature: Running paperclip in a Rails app using basic S3 support
+
+  Scenario: Basic utilization
+    Given I generate a rails application
+    And I have a "users" resource with "name:string"
+    And I run "script/generate paperclip user avatar"
+    And I save the following as "app/models/user.rb"
+    """
+    class User < ActiveRecord::Base
+    has_attached_file :avatar,
+                      :storage => :s3,
+                      :bucket => "jyurek",
+                      :s3_credentials => "config/s3.yml"
+    end
+    """
+    And I save the following as "config/s3.yml"
+    """
+    access_key_id: <%= ENV['AWS_ACCESS_KEY_ID'] %>
+    secret_access_key: <%= ENV['AWS_SECRET_ACCESS_KEY'] %>
+    bucket: paperclip
+    """
+    And I save the following as "app/views/users/new.html.erb"
+    """
+    <% form_for @user, :html => { :multipart => true } do |f| %>
+      <%= f.text_field :name %>
+      <%= f.file_field :avatar %>
+      <%= submit_tag "Submit" %>
+    <% end %>
+    """
+    And I save the following as "app/views/users/show.html.erb"
+    """
+    <p>Name: <%= @user.name %></p>
+    <p>Avatar: <%= image_tag @user.avatar.url %></p>
+    """
+    And this plugin is available
+    And the rails application is prepped and running
+    When I visit /users/new
+    And I fill in "user_name" with "something"
+    And I attach the file "test/fixtures/5k.png" to "user_avatar"
+    And I press "Submit"
+    Then I should see "Name: something"
+    And I should see an image with a path of "http://paperclip.s3.amazonaws.com/system/avatars/1/original/5k.png"
+    And the file at "http://paperclip.s3.amazonaws.com/system/avatars/1/original/5k.png" is the same as "test/fixtures/5k.png"