Bump graph linelabel down by 30px

Adding margin-top to the linelabel moves it down the page, which
means it is included in the rectangle that screenshot-as-a-service
uses and so the image will no longer be clipped.
Make sure bundler is installed

Travis seems to have forgotten about installing bundler in our latest
builds, causing them to fail. We should probably just ensure it has
always been installed before we start trying to install gems. This
shouldn't affect the build if Travis decides to reinstate bundler.
Make rvm use 1.9.3

I've had a chat to the Travis guys in IRC and they suggested forcing rvm
into 1.9.3 to help fix this issue. They will be rolling out a fixed VM
later today.
Merge pull request #194 from alphagov/travis-is-annoying

Make sure bundler is installed
Move colour bar out of breadcrumbs

When we have static pages in Spotlight, we'll want to include the colour
bar on pages where we don't have any breadcrumbs (eg the homepage).

This commit separates the two so they can be used independently.
Only display breadcrumb wrapper if crumbs exist
Move common configuration out of process_request

We'll need to reuse this configuration in all Spotlight pages, not
just pages that make use of process_request.
Add homepage

I've made a couple of changes while moving it across:

- Change link to blog and link text to be correct
- Remove live GOV.UK usage module (should be easy to re-add?)
- Add height and width to Transactions Explorer image, make it a link
Merge pull request #191 from alphagov/62831182-clipped-linelabel-screenshot

Bump graph linelabel down by 30px
Merge pull request #193 from alphagov/static-page-preparation

Add homepage
Add Performance Platform labs page
Update PP Labs page with images, email etc
Merge pull request #195 from alphagov/performance-platform-labs

Add Performance Platform labs page
Add a 'mailto:' to an email address link
Rename labs page to prototypes page
Merge pull request #196 from alphagov/rename-labs-prototypes

Rename labs page to prototypes page
Remove Flood tracker, rearrange page
Sass fixes to static pages
Merge pull request #197 from alphagov/proto-remove-flood-tracker

Remove the flood tracker prototype from the prototypes page
Merge