Tiny #usability #accessibility fix - newsletter signup requires an email - http://i.imgur.com/QF4BQrH.png

(this is because I thought 'join forces' button is getting me somewhere, only until later I realised that it is 'submit' button - if the email was 'required' it would be easier for me)
Merge pull request #125 from stefek99/gh-pages

Tiny #usability #accessibility fix - newsletter signup requires an email