Integrate previous work on haystack/elasticsearch into current search/explore UI
Adjust boost values for title, abstract
Remove 'iid' or rename to 'id', tweak search_indexes
Merge remote-tracking branch 'origin/master' into haystack2
Make haystack/elasticsearch optional
Redirect search API calls to Haystack if activated
OGC_SERVER setting can now be an empty dictionary
Merge pull request #1445 from ingenieroariel/simple

OGC_SERVER setting can now be an empty dictionary
Fix whitespace

Don't mix tabs and spaces
Merge pull request #1446 from jean/master

Fix whitespace
autofill doc title on upload
Add the USE_DOCUMENTS context back to the resource_urls context processor.
Merge pull request #1449 from spatialnetworks/vanilla

autofill doc title on upload
Merge pull request #1423 from mbertrand/haystack2

Integrate previous work on haystack/elasticsearch
Removed conditional imports in search_indexes.

It was not really needed because those are only imported if haystack is configured.
Simplified thumbnail handling for layers

The indirect approach was causing a lot of unnecesary requests to GeoServer, moved all thumbnail handling to the pmethod that creates links. There is also a new link for Thumbnails in there.
Fixed missing import in proxy module
Update geoexplorer.txt
Update geoexplorer.txt
Safely check for settings.HAYSTACK_SEARCH and small PEP 8 improvements.