Provide "maternity box" for newborn babies

Modelled after the Finnish system. 
* http://www.kela.fi/web/en/maternitypackage
* http://www.buzzfeed.com/erinlarosa/heres-the-amazing-maternity-gift-box-all-new-parents-in-finl
* http://www.bbc.com/news/magazine-22751415

A key component of this — that isn't always recognised in articles about it — is that it's conditional on registering for pre-natal care. This is widely credited as a key reason for Finland having one of the lowest rates of infant mortality in the world (and almost half that of the UK at present).
Add link to Finnish example
Merge pull request #226 from tmtmtmtm/patch-1

Provide "maternity box" for newborn babies