Allowed detailed guides to be tagged to policies
Skip image errors on create from published edition

content that was imported had smaller inline
images than the ones we allow - 960x640. for
now, we are allowing such images to be carried
over to new drafts created from such published
editions. there will be more work done on this
as part of:

https://www.pivotaltracker.com/story/show/69931140
Add warning to group admin page.

https://www.pivotaltracker.com/story/show/69439794
Merge pull request #1440 from alphagov/group_create_warning

Add warning to group admin page.
Merge pull request #1438 from alphagov/detailed-guides-associated-with-policies

Allowed detailed guides to be tagged to policies
Add group create warning to new page as well.
Merge pull request #1439 from alphagov/skip-image-validation-when-creating-from-draft

Skip image errors on create from published edition
Merge pull request #1441 from alphagov/group_create_warning

Add group create warning to new page as well.
Prevent double-width feature 500ing with no image.
Merge pull request #1442 from alphagov/prevent-double-features-500-with-no-image

Prevent double-width feature 500ing with no image.
Add need_ids attribute to detailed guides
Detailed guides: show goals for associated needs
Editing need ids for detailed guides
Validate that detailed guide need ids are 6 digits
Simplify PanopticonRegisterArtefactWorkerTest with test helper
Register need_ids with panopticon for detailed guides