Send non-images as attachments to force downloads

This fixes a bug in IE where it won't download any attachments at all,
as we previously sent them all as `inline`.

https://www.pivotaltracker.com/story/show/42949101
Add Map as a type of Publication
Don't send duplicate emails to editors

Previously we would send an email to each author of a document. If you
were responsible for many changes this would mean you would be listed as
an author many times. This should restrict it to only send you one
email.
Sort Whip Organisations

Whip Organisations need to be displayed in a certain order. This ensures
they are in the order we specify. Also updated the label of the
Baroness and Loards in Waiting to be Baronesses.
Merge pull request #250 from alphagov/sorting-whips

Sort Whip Organisations

https://www.pivotaltracker.com/story/show/44795495
Merge pull request #246 from alphagov/dynamic-content-disposition-for-attachments

Send non-images as attachments to force downloads

https://www.pivotaltracker.com/story/show/42949101
Merge pull request #248 from alphagov/email-notifications

Don't send duplicate emails to editors

https://www.pivotaltracker.com/story/show/43324411
Merge pull request #247 from alphagov/map-publications

Add Map as a type of Publication

https://www.pivotaltracker.com/story/show/43302369
Remove search_index definitions on fields now covered

by search_format_types
Remove organisation classes from featured news

They don't actually provide any help being there but sometimes cause the
colours of the links to get confused if the precidence of the department
is in question.

https://www.pivotaltracker.com/story/show/38430517
Fix broken upload tests
Actually fix the tests by removing disposition

This doesn't really have any relevance to whether things are
public/private or not, and it's complicated by the image/document switch
in the logic.