Remove content store rake task

This should've never been added as it was renamed to publishing_api.rake
Merge pull request #75 from alphagov/remove-content-store-rake-task

Remove content store rake task
Singularise RAIB Report types

A report cant be a bulletins
Merge pull request #76 from alphagov/singular-report-types

Singularise RAIB Report types
Add report type to MAIB

With the current architecture, a report type facet is required to expand
the metadata in specialist frontend.
Merge pull request #77 from alphagov/add-report-type-to-maib

Add report type to MAIB
Add keyword search placeholder for MHRA finders

MHRA users think update or alert title is a weird placeholder as they
search for drug or device name.
Merge pull request #78 from alphagov/add-keyword-search-placeholder-for-mhra-finders

Add keyword search placeholder for MHRA finders
Placeholders should be lower case

With the different placeholder for MHRA finders, the placeholder was
incorrectly starting with an uppercase letter.
Merge pull request #79 from alphagov/lower-case-placeholder

Placeholders should be lower case
Add rake task to create all topics on govdelivery

We need to provide the ability for users to sign up for a format, with
filters based on a single field.

This rake task precreates all the necessary topics for each combination
of options. For formats with no options, it will create a single list
for the entire format.
Push signup options to publishing api

finder front end will use these to build the checkbox options for a
format.