[EmptyHomes] decommissioning tweaks
[EmptyHomes] survey template tweaks
Merge branch 'emptyhomes-decommissioning-2014'
[EmptyHomes] remove custom text

Link is broken, and a variant of the text has been added to the
explanatory emails.
Update test for changes in 6eff7846.
Simplify z-index of banners.

Constrain the map in a position:relative to give it its own stacking
context. This simplifies these z-indices and prevents the elements from
floating above the main header. Fixes #673.
Allow multiple arguments to make_css.
[Hart] Remove unnecessary z-indices.

No longer needed due to core changes.
Merge remote-tracking branch 'upstream/master' into baiki