Emails for contacts without postal addresses do not float

This was causing issues where the comment text would display oddly
next to the email address, and caused additional issues in IE.
Remove references to text extraction from README.

We disabled this feature entirely in 3d6d9382c1b8dc4c645.
Switch rummager S&I request to use a count string.

Using the integer 0 gets translated into an empty
param value.  Only the string "0" makes it through.
Fix test to expect string "0"
Merge pull request #1725 from alphagov/fix-services-and-information-rummager-count-type

Switch rummager S&I request to use a count string.
Merge pull request #1710 from alphagov/undocument-text-extraction

Remove references to text extraction from README
Set cache-control for replacement attachment redirects

These currently return a 301 with Cache-Control set to private (because
that's the default unless otherwise specified).  This means that these
requests can't be cached in the CDN etc.

This sets a cache-control header to the default uploads_cache_max_age.
fix typo
Merge pull request #1727 from rjc123/patch-14

Fix typo
Merge pull request #1726 from alphagov/attachment_replacement_cache_control

Set cache-control for replacement attachment redirects
Merge pull request #1708 from alphagov/fix-contact-email-display

Emails for contacts without postal addresses do not float

This was causing issues where the comment text would display oddly
next to the email address, and caused additional issues in IE.

Related Zendesk ticket: https://govuk.zendesk.com/agent/#/tickets/821859