LILY-189: fix broken export
Merge pull request #15 from HelloLily/fix-export-csv

LILY-189: fix broken export
LILY-193: Added archive feature for email
Merge pull request #3 from HelloLily/feature/email-archiving

LILY-193: Added archive feature for email
Added PolymorphicSingleTenantMixin so single tenant mode works too
LILY-319: Make sure accounts with attached users can't be deleted
Merge pull request #16 from HelloLily/feature/LILY-319-prevent-own-account-delete

LILY-319: Make sure accounts with attached users can't be deleted
Fixed some bugs regarding Dataprovider
Some improvements to the form ux
Merge pull request #13 from HelloLily/feature/better-ux

Feature/better ux
added config file for Review Board
Add unknown gender
Merge branch 'fix/contact/gender' into develop
Gender may also be Other
Added tenant mixin to accounts_website
Merge branch 'fix/website/tenantmixin' into develop
LILY-227: multiline recipients accepted when sending mail
Merge branch 'fix/email/multi-recipients' into develop
Ready for deploy
LILY-323: Fix back button for contact edit/add form