Add link to Services and Information page

Where an organisation displays a block of "Services and guidance" at
the top of the page, include a link through to the new Services and 
Information page for the org.

There's some fiddly CSS here, due to a style rule in another file 
overriding the padding-left value for the link. I'd like to know if this
could be implemented in a cleaner way.
Fix missing organisation metadata

Example - https://www.gov.uk/government/ministers/foreign-secretary

• added code to include org meatadata
• wrapped in if statement to not show if a minister has no org

https://www.pivotaltracker.com/story/show/75507696

Reverting show to use the org name list partial and updating so that
it uses organisations instead of lead_organisations

This is after discussion with Tekin
Removing unused lead_organisations and show_hm_government from org
name list partial and updating topics and topical events show pages

Again this follows a discussion with Tekin

Remove unecessary if statement
Only show the 'see all' link on select organisations

Use a whitelist (defined in the Organisation model) to determine which 
organisations will display the 'see all' link at present.
Show inline attachments on worldwide org pages.

Use the govspeak_edition_to_html helper, which requires the whole Edition object
rather than just the body. To enable this, make HasCorporateInfo.about_us a
public method.
Merge pull request #1633 from alphagov/fix-broken-minister-metadata

Fix missing organisation metadata
Only enable for the Maritime and Coastguard Agency
Revert "Use the time now as a default from filter for upcoming announcements"

This reverts commit 7085ad37260e5975b4b0e2215dee3b737708526f.
Merge pull request #1637 from alphagov/see-all-topics-link

Add a link from the organisation page to its services and information page
Revert "Revert "Use the time now as a default from filter for upcoming announcements""

This reverts commit c047d1b75babfde185a1bb5b43e3d9a9e5f6394a.
Merge pull request #1641 from alphagov/revert-stats-filter-date-change

Revert stats filter date changes
Pass Rummager a Date, which it expects, not Time
Update instructions for running against rummager

The host that people using VMs will usually want to use now is
search.dev.gov.uk, so say that in the instructions.  Also, explain how
to get a search index replica with a single command, since most people
can use that rather than having to build their own.
Merge pull request #1643 from alphagov/update-readme-about-search

Update instructions for running against rummager
Merge pull request #1642 from alphagov/fix_default_from_date_to_upcoming_stats_filter

Fix default from date to upcoming stats filter
Prevent errors being caused by nil parameter

Not all worldwide organisations will have an about page, or at least
they won't until one is created.
Merge pull request #1640 from alphagov/worldwide_cips

Show inline attachments on worldwide org pages.
Remove explicit sanitize dependency

Govspeak 2.0 upgrades the version of sanitize to 2.1.0. We no longer
need to force a version of sanitize here because the changes included in
the alphagov fork have been merged upstream.