Added testing for grading settings

Please note that 2 tests will not reliably work:
Deleting a grade- Was able to circumvent this with javascript
Moving the grade slider- Could not circumvent, is skipped but the framework is in place

cms/djangoapps/contentstore/features/grading.feature

+Feature: Course Grading
+    As a course author, I want to be able to configure how my course is graded
+
+    Scenario: Users can add grading ranges
+        Given I have opened a new course in Studio
+        And I am viewing the grading settings
+        When I add "1" new grade
+        Then I see I now have "3" grades
+
+    Scenario: Users can only have up to 5 grading ranges
+        Given I have opened a new course in Studio
+        And I am viewing the grading settings
+        When I add "6" new grades
+        Then I see I now have "5" grades
+
+    #Cannot reliably make the delete button appear so using javascript instead
+    Scenario: Users can delete grading ranges
+        Given I have opened a new course in Studio
+        And I am viewing the grading settings
+        When I add "1" new grade
+        And I delete a grade
+        Then I see I now have "2" grades
+
+    #Cannot reliably move the slider
+    @skip
+    Scenario: Users can move grading ranges
+        Given I have opened a new course in Studio
+        And I am viewing the grading settings
+        When I move a grading section
+        Then I see that the grade range has changed
+
+    Scenario: Users can modify Assignment types
+        Given I have opened a new course in Studio
+        And I have populated the course
+        And I am viewing the grading settings
+        When I change assignment type "Homework" to "New Type"
+        And I go back to the main course page
+        Then I do see the assignment name "New Type"
+        And I do not see the assignment name "Homework"
+
+    Scenario: Users can delete Assignment types
+        Given I have opened a new course in Studio
+        And I have populated the course
+        And I am viewing the grading settings
+        When I delete the assignment type "Homework"
+        And I go back to the main course page
+        Then I do not see the assignment name "Homework"
+
+    Scenario: Users can add Assignment types
+        Given I have opened a new course in Studio
+        And I have populated the course
+        And I am viewing the grading settings
+        When I add a new assignment type "New Type"
+        And I go back to the main course page
+        Then I do see the assignment name "New Type"

cms/djangoapps/contentstore/features/grading.py

+#pylint: disable=C0111
+#pylint: disable=W0621
+
+from lettuce import world, step
+from common import *
+
+
+@step(u'I am viewing the grading settings')
+def view_grading_settings(step):
+    world.click_course_settings()
+    link_css = 'li.nav-course-settings-grading a'
+    world.css_click(link_css)
+
+
+@step(u'I add "([^"]*)" new grade')
+def add_grade(step, many):
+    grade_css = '.new-grade-button'
+    for i in range(int(many)):
+        world.css_click(grade_css)
+
+
+@step(u'I delete a grade')
+def delete_grade(step):
+    #grade_css = 'li.grade-specific-bar > a.remove-button'
+    #range_css = '.grade-specific-bar'
+    #world.css_find(range_css)[1].mouseover()
+    #world.css_click(grade_css)
+    world.browser.execute_script('document.getElementsByClassName("remove-button")[0].click()')
+
+
+@step(u'I see I now have "([^"]*)" grades$')
+def view_grade_slider(step, how_many):
+    grade_slider_css = '.grade-specific-bar'
+    all_grades = world.css_find(grade_slider_css)
+    assert len(all_grades) == int(how_many)
+
+
+@step(u'I move a grading section')
+def move_grade_slider(step):
+    moveable_css = '.ui-resizable-e'
+    f = world.css_find(moveable_css).first
+    f.action_chains.click_and_hold().move_by_offset(100, 100).release().perform()
+
+
+@step(u'I change assignment type "([^"]*)" to "([^"]*)"$')
+def change_assignment_name(step, old_name, new_name):
+    name_id = '#course-grading-assignment-name'
+    index = get_type_index(old_name)
+    f = world.css_find(name_id)[index]
+    assert index != -1
+    for count in range(len(old_name)):
+        f._element.send_keys(Keys.END, Keys.BACK_SPACE)
+    f._element.send_keys(new_name)
+
+
+@step(u'I go back to the main course page')
+def main_course_page(step):
+    main_page_link_css = 'a[href="/MITx/999/course/Robot_Super_Course"]'
+    world.css_click(main_page_link_css)
+
+
+@step(u'I do( not)? see the assignment name "([^"]*)"$')
+def see_assignment_name(step, do_not, name):
+    assignment_menu_css = 'ul.menu > li > a'
+    assignment_menu = world.css_find(assignment_menu_css)
+    allnames = [item.html for item in assignment_menu]
+    if do_not:
+        assert not name in allnames
+    else:
+        assert name in allnames
+
+
+@step(u'I delete the assignment type "([^"]*)"$')
+def delete_assignment_type(step, to_delete):
+    delete_css = '.remove-grading-data'
+    delete = world.css_find(delete_css)[get_type_index(to_delete)]
+    delete.click()
+
+
+@step(u'I add a new assignment type "([^"]*)"$')
+def add_assignment_type(step, new_name):
+    add_button_css = '.add-grading-data'
+    world.css_click(add_button_css)
+    name_id = '#course-grading-assignment-name'
+    f = world.css_find(name_id)[4]
+    f._element.send_keys(new_name)
+
+
+@step(u'I have populated the course')
+def populate_course(step):
+    step.given('I have added a new section')
+    step.given('I have added a new subsection')
+
+
+def get_type_index(name):
+    name_id = '#course-grading-assignment-name'
+    f = world.css_find(name_id)
+    for i in range(len(f)):
+        if f[i].value == name:
+            return i
+    return -1