Resolved flake8 issues #2713

Review ID: 460001
Merge pull request #19 from priyankarani/feature/flake8

Resolved flake8 issues #2713
Migrate to 2.8 #2720

Review ID: 467001
Bump version to 2.6.0.3
Merge branch 'release/2.6.0.3' into develop
Merge branch '2.8' of github.com:priyankarani/nereid-cms into priyankarani-2.8
Bump version to 2.8.0.1
Merge branch 'release/2.8.0.1' into develop
[Nereid] Migrate nereid-cms to 3.0 #3128

* Removed en_US from urls
* Modified tests to work

Project-ID: 989
Task-ID: 3128
Merge pull request #26 from uditagarwal/develop

[Nereid] Migrate nereid-cms to 3.0 #3128
[Nereid] Issue#24 Fix for Nereid CMS #3163

* Fixed the check_constraint method by using
  the right method
* Fixed selection field on Menu Item not saving
  if list is empty
* Wrote test

Project-ID: 989
Task-ID: 3163
Git Issue: https://github.com/openlabs/nereid-cms/issues/24
Merge pull request #27 from uditagarwal/develop

[Nereid] Issue#24 Fix for Nereid CMS #3163
Bump version to 3.0.1.1
Merge branch 'release/3.0.1.1' into develop
Fix ArticleCategory on change title to write on unique_name and not in
title.
Fix ArticleCategory on change title to write on unique_name and not in
title.
Bump to 3.0.2.0dev
Move views to view folder #3351

Review-Id: 1403001
Improve nereid-cms/banner UX
Add missing id for group