[#159] Use thumbnail for partner site map popup

The map of projects on the partner sites home page uses the original
image in the popups dispayed when you click a pin.

Fix by using the named thumbnail "map_thumb" instead.
Merge pull request #355 from akvo/feature/cname_urls

Feature/cname urls - reviewed and merged
[#367]Implement new thumbnail processor
[#367]Implement new thumbnail processor
Merge branch 'feature/padded_thumbnail' of https://github.com/akvo/akvo-rsr into feature/padded_thumbnail
Fix missing newline
Merge branch 'feature/padded_thumbnail' of https://github.com/akvo/akvo-rsr into feature/padded_thumbnail
Fix missing import
Fix to test_from_xpath

If the element has no text strip() will fail.
Merge branch 'develop' into feature/padded_thumbnail
[#367] Fix padding processor

Add conditional so processor only runs when pad argument is supplied

Fix box calculation and cast box numbers to ints

Add fb_thumb to organisation.logo
[#367]Use new thumbnails for organisations and projects
[#364] Fix resource name for IATIBenchmarkResource

The resource_name attribute in the IATIBenchmarkResource meta class was
wrong, probably a cut'n'paste error.
Merge branch 'feature/padded_thumbnail' into develop
[#367]Media path fix
Merge branch 'feature/padded_thumbnail' into develop
[#367]Handle missing project images on main site
Merge branch 'feature/padded_thumbnail' into develop
Merge branch 'master' of github.com:akvo/akvo-rsr into develop
[#331] Optimizations of ProjectMapResource

Use select_related() for the resource's queryset and remove the
locations ToMany field to reduce the number of database queries to one
per project (used to be four).