[#296] Fix bug in Cordaid organisations import

Fix bug where the creation of an organisation fails if the XML doesn't
have a <url> tag.
[#196] Fall back to Akvo logo if project image too small or missing
Merge branch 'feature/meta-tags' into develop
[#196]Complete URLs everywhere. Fix indentation.
Merge branch 'feature/meta-tags' into develop
[#196] add FB app id to meta tags
Merge branch 'feature/meta-tags' into develop
[#196] Add missing newline
Merge branch 'feature/meta-tags' into develop
[#230]add meta tags to partner organisation page
Merge branch 'feature/meta-tags' into develop
[#230]refer to partner, not org, which is principal of the site
Merge branch 'feature/meta-tags' into develop
Add an experimental placeholder footer to admin pages
Merge branch 'release/candidate' of github.com:akvo/akvo-rsr into develop
[#173]read and display version info
Merge branch 'feature/git_info' into develop
[#173]Use URL for correct project
Merge branch 'feature/git_info' into develop
[#173]Make tag into Github link