Add some visual styling to doc series
Update doc count and remove unused templates

There is no index action on the document series controller - the
organisations controller has a document_series action instead. Leaving
reworking this to be more RESTful for the story that will untie series
from organisations.
Improve document series adding feedback

Search results that are already part of the series will be identified
as such. We also update the search results to reflect once a document
has been added. To do this, I've moved the search action out of the
main editions controller. I had hoped to make this a generic search
action, but the mustache template was already tied to document series
management, so it was only a half measure anyway.
Add warning message regarding document series
Search result visual tweaks
Handle non-published editions in search results
Update DOM ids in mustache template
Rework document series management scenarios

Regressions for the key features and those not covered by existing
functional tests
Rename partial to reflect better what it is.
Invoke mustache compilation for cucumber features

We now have cucumber scenarios testing admin features that rely on
mustache templates. To ensure these work, we need to compile these
templates before the features are run.
Can directly assign series for speed tagging

There is no guard that specifically controls the direct assignment of
document series on an edition; we simply rely on the user interface to
prevent it for normal editors.
Document finder handles 500 errors
Fix screwy markup
Move css for document finder to helper folder
Don't create global css classes unnecessarily
Give loading spinner a transparent background
Remove commented-out code
Merge pull request #776 from rjc123/patch-2

https://www.pivotaltracker.com/story/show/55377246

All-document-mappings file now excludes non-valid "open" attachments
Tweak BulkUpload unit test descriptions
Add caviat for search limiting