Make the missing data message in table modules span the full width

It looks nicer.

Also don't try to float the headers of really short tables (in particular, ones that contain only a no data message)
Updated tests to cater for how we now render "No data available"
Add filtering based on department title and abbreviation to services page
Merge pull request #494 from alphagov/feature/missing-table-data

Make the missing data message in table modules span the full width
Add deparment.abbr to required fields in dashboard schema

If a service has a department, than that department should have an abbreviation.
Used for filtering and catergorisation in the services page.
Merge pull request #496 from alphagov/feature/department-filtering

Add filtering based on department title and abbreviation to services page
Use Node's graceful-fs to cope with many files.

Node's graceful-fs module makes it possible for us to run our
stub validation and service generation scripts against many
hundreds of files, without OSs complaining about too many files
being open.
Merge pull request #499 from alphagov/enhancement/use-node-graceful-fs

Use Node's graceful-fs to cope with many files.
Bump GOV.UK template from 0.7.1 to 0.8.0

https://github.com/alphagov/govuk_template/compare/v0.7.1...v0.8.0

- Moves cookie message above header
- Fixes HTML-escaping of asset path using Mustache
- Switch to using the new global colour bar
Merge pull request #500 from alphagov/update-govuk-template-0-8-0

Bump GOV.UK template from 0.7.1 to 0.8.0
Refactor dashboard views to inherit from base view

Removes all the if statements to render dashboard elements based on dashboard type. Instead instantiate different dashboard views depending on the type.
Use slug for checking for top-level site activity dashboard

Instead of using the page title, because the slug is far less likely to change.
Stop using "other" nested property for tagline

Start using only the top level tagline property.
Make corresponding change to dashboard configs.
Merge pull request #498 from alphagov/bugfix/content-dashboard-breadcrumbs

Refactor dashboard views to inherit from base view
Make breadcrumbs fail nicely without department

Instead of crashing.
Add stub dashboard for Tier 2 Visit Visa