study csv export and implementation

Feature: Export Studies as CSV

  Background:
    Given a study "Study 1" with:
      | id             | 1        |
      | state          | building |
      | locked_version | 1        |
    And a study "Study 2" with:
      | id             | 2          |
      | state          | production |
      | locked_version | 2          |

  Scenario: Export studies list as csv
    When I sign in as a user with all permissions
    And I browse to studies list
    Then I see "Study 1"
    And I see "Study 2"
    When I click "CSV"
    Then I download a CSV with content:
      | Id | Name    | State      | Locked version | Created at | Updated at |
      | 1  | Study 1 | building   | 1              | <ISO_DATE> | <ISO_DATE> |
      | 2  | Study 2 | production | 2              | <ISO_DATE> | <ISO_DATE> |


  csv do
    column :id
    column(:name) { |study| study.object.name }
    column(:state) { |study| study.object.state }
    column :locked_version
    column :created_at
    column :updated_at
  end