Merge pull request #655 from akvo/develop

[#654] Merging develop into release/candidate for testing
#654 release notes created
Revert "#654 release notes created"

This reverts commit 291318f4a5e3515406388b377d8804829bcac755.
#644 release notes for 2.3.9
[#656] Add API resource for PartnerSite

Also add fitler setting to be able to filter on keywords in
partner_site and project resources.
[#656] PEP8-ish fixes
Merge pull request #660 from akvo/feature/656_partner_site_resource

[#656] Add API resource for PartnerSite
#644 Fixing spelling and mistake for tagrte group
[#620] Added update info to partnersite projects
Merge pull request #666 from akvo/hotfix/620_keywords_filter

[#620] Added update info to partnersite projects
[#667] Fix data for map on Akvo at a glance page

The live database has two projects with a primary_location field that is
set, but the location object is not present in the DB.

Fix by adding a filter that removes projects without a valid primary
location object.
Merge pull request #668 from akvo/hotfix/667_data_overview

[#667] Fix data for map on Akvo at a glance page
[#654] Merge branch 'release/candidate' into develop