Make module_actions JavaScript more reusable

Rename module_actions to popover (à la iOS) so that we can use it
for a dashboard's related links. Include a basic first pass of
popover in related_pages.
Move popover related Sass into a single file

Use mixins to include it in multiple places.
Reorganise index.scss into logical groups

Also rename module_actions to module_more_info for ease of scanning.
Merge branch '62545960-hide-related-links-small-screens' of github.com:alphagov/spotlight
Add first version of "who is using g-cloud" graph
Add first version of "division of procurement" graph
Test against (what i think will be) the real data after the fix
What the actual fix may loook like
Fix json for working response
Just use utc
Get moment should fix things... but where does moment come from?
fix tests - we will always use utc
remove logs
Merge branch 'master' into test-backdrop-data-fixes

Conflicts:
	app/support/backdrop_stub/response_fetcher.js
Amend graph title
Update data URLs to match Backdrop
Add "total" option in Stagecraft stub, and "total" line to graph
Move popover related Sass into a single file

Use mixins to include it in multiple places.
Reorganise index.scss into logical groups

Also rename module_actions to module_more_info for ease of scanning.
Add first version of "who is using g-cloud" graph