#510 added resource and tidied up docs
[#252] Removed all xml:lang attributes except default from XML
[#252] Updated language tag check
[#252] Remove correct child nodes
[#252] Removed unnecessary child.getparent() call
Merge pull request #602 from akvo/master

[#592] Adding release notes for 2.3.7
#601 fix to release notes pages not sites
Merge pull request #603 from akvo/feature/601-releasenotesfix

#601 fix to release notes pages not sites
[#278] Updated user profile permissions for akvo managers and editors
[#608] Changed organisation account types
[#255] Added target group field to project main page
[#441] Added search on project id, changed filter from OR to AND
[#362] Removed old maps and utils files
[#362] Removed integration and deployment (except pip) directories
[#477] Replaced created_at and last_modified_at with null instead of True
[#362] Removed config/server folder and budget totals script
Merge pull request #621 from akvo/release/candidate

[#612] Merge release/candidate back into develop
Merge branch 'develop' into feature/#608_account_types
[#477] Merge branch 'develop' into feature/477_api_modified_field
[#441] Merge branch 'develop' into feature/441_improve_search