First attempt at the frontend part of a styleguide
Typos and such
DRY up templates by re-using reference_fields partial
Add new attachment fields for House of Commons papers
Add House of Commons paper fields to publication attachments
Show HoC metadata on attachments tab
Attachment can list possible parliamentary sessions
Relax validation on HoC paper number

They're typically numbers, but can also be formatted 1234-i or 1234-ii.
Use pull down menu for parliamentary sessions
Remove tests that aren't likely to fail

These tests are really just testing with or not ActiveSupport's
`#present?` works. It's not logic that's likely to break, so we'll be
better off with a slightly faster test suite.
Link of to relevent external repos and typos

Also added a note about `js-` prefixes and not touching the `base-ie`
classes.
Use hyphens to format parliamentary sessions

There's even a style guide. See page 3...

http://www.parliament.uk/documents/commons-information-office/p12.pdf
Show HoC metadata on publication attachments
Some minor translation key fixes

Tracker story: https://www.pivotaltracker.com/story/show/52805441
More translation fixes
Allow parliamentary session to be unset
Allow HoC metadata on consultations
Merge pull request #682 from alphagov/styleguide

First stab at writing a styleguide
Support hoc_paper_number and parliamentary_session on AttachmentsPresenter
Fix naming of data migration CSV file

Thanks @jamiecobbett!