Removed commented out and single textbook test scenario

cms/djangoapps/contentstore/features/textbooks.feature

 @shard_2
 Feature: CMS.Textbooks
-
-  Scenario: No textbooks
-    Given I have opened a new course in Studio
-    When I go to the textbooks page
-    Then I should see a message telling me to create a new textbook
-
-# Flaky test, disabled 03/13/2015. TNL-1679.
-#  Scenario: Create a textbook
-#    Given I have opened a new course in Studio
-#    And I go to the textbooks page
-#    When I click on the New Textbook button
-#    And I name my textbook "Economics"
-#    And I name the first chapter "Chapter 1"
-#    And I click the Upload Asset link for the first chapter
-#    And I upload the textbook "textbook.pdf"
-#    And I save the textbook
-#    Then I should see a textbook named "Economics" with a chapter path containing "/static/textbook.pdf"
-#    And I reload the page
-#    Then I should see a textbook named "Economics" with a chapter path containing "/static/textbook.pdf"
-
+  
   Scenario: Create a textbook with multiple chapters
     Given I have opened a new course in Studio
     And I go to the textbooks page