Add Piwik tracking code.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Fix some tests that were broken by content changes.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Add collect-email handler.

Signed-off-by: Daira Hopwood <daira@leastauthority.com>
Merge branch 'collect-email' of https://github.com/LeastAuthority/leastauthority.com into new-products
Copy changes to signup thankyou templates: added link to lafs installation docs