added to admin section: which users are under the age of 13 #1283
Merge branch 'feature/1283-coppa-admin' of https://github.com/diasp/diaspora into diasp-feature/1283-coppa-admin
make age search postgres compatible, add spec, changelog
Merge pull request #4252 from Raven24/diasp-feature/1283-coppa-admin

Admin: find users under the age of 13 (COPPA)