Changed way feature flags are interpreted

Configurations must be defined before hand

Reduced pylint violations

We only support 4 browsers

cms/djangoapps/contentstore/features/checklists.feature

@@ -12,7 +12,6 @@ Feature: Course checklists
 
   # There are issues getting link to be active in browsers other than chrome
   @skip_firefox
-  @skip_opera
   Scenario: A task can link to a location within Studio
     Given I have opened Checklists
     When I select a link to the course outline
@@ -22,7 +21,6 @@ Feature: Course checklists
 
   # There are issues getting link to be active in browsers other than chrome
   @skip_firefox
-  @skip_opera
   Scenario: A task can link to a location outside Studio
     Given I have opened Checklists
     When I select a link to help page

cms/djangoapps/contentstore/features/upload.py

@@ -10,6 +10,7 @@ import os
 
 TEST_ROOT = settings.COMMON_TEST_DATA_ROOT
 
+
 @step(u'I go to the files and uploads page')
 def go_to_uploads(_step):
     menu_css = 'li.nav-course-courseware'
@@ -106,8 +107,8 @@ def get_index(file_name):
 def get_file(file_name):
     index = get_index(file_name)
     assert index != -1
-
     url_css = 'a.filename'
+
     def get_url():
         return world.css_find(url_css)[index]._element.get_attribute('href')
     url = world.retry_on_exception(get_url)