Tidying while reading

Avoid deep indentation, use more levels of headings instead.
Some more doc tweaks
Moves geoserver-specific url routes to the geoserver app.

* acls, resolve_user and layer_batch_download have been moved to /gs/acls, gs/resolve_user, and gs/download.
* The old routes (using the /layer prefix) still work, but should be removed once legacy code is updated.
Merge pull request #1460 from garnertb/gs-layer-views

Moves geoserver-specific url routes to the geoserver app.
Tidying while reading

Indentation fixed on one section too.
Tidying while reading

Avoid deep indentation, use more levels of headings instead.
Some more doc tweaks
Tidying while reading

Indentation fixed on one section too.
Merge pull request #1461 from jean/master

Tidying while reading
Add geoserver context to the layer detail view and add the store_type helper.