Further changes for Text field should be mandatory for option based questions. ...

Fix for issue #1725

The question_options field on the Customisable Phase template has the
following changes:
- the 'Text' label has the asterick for required.
- the error message for missing question option now reads
 "You must have at least one option with accompanying text."
- Corrected some Rubocop errors on the files added.

Updated JS for requiredField to allow for dynamically loaded DOM elements (#1996) ...

* IssueID #1725 - Updated messages Question text and option presence messages.

* updated requiredField.js to allow for dynamically loaded DOM elements

* fixed broken tests

Fix for ensuring that Questions that are option based must have atleast one non-blank text entry. ...

- Validation added for option based questions to ensure text field non-blank.
    - Validation message OPTION_PRESENCE_MESSAGE added to app/models/concerns/validation_messages.rb.
    - Added ':allow_nil => true' to
            delegate :option_based?, to: :question_format, :allow_nil => true
     in Question model to prevent NoMethodError if question_format is nil.

    Fix for #1725

Add extra validations for all models ...

- Includes specs using the Shoulda gem
- Includes a refactoring of update_numbers to a "sortable" abstraction