Rename doc-index to editions-index and move to view folder
Simplify admin organisation and author filter

"My organisation" is now in organisation dropdown, "Me" is now in
author dropdown.
Simplify admin state and type filters
Simplify admin world location filter

Only a single location can be selected, but with a special case
of "user" where it filters by all of the user's world locations.
Remove redundant world location JS
Tidy up edition filter markup
Re-styling admin editoins filter page
• style filter panel which Ben tweaked functionaility on
• tidy styling on filter table and pagination
Use js-hidden class to stop flashing of buttons
Get features green again

I've had to give the filter forms ids as otherewise we have 6 "Go"
buttons on the page and no way to distinguish between them in our
cucumber scenarios.