Fix mapit 404 being shown issue.

* Move 404 template into country apps
* load country app before mapit

Stems from commit 09640b660c38bcaf286b827c37dffb9f815e38c4 I suspect

Closes #576
Create a new app just to hold changes to the admin. Move admin template overrides into it. Closes #579
Merge branch 'master' into production