Dev updates 22/01/2016

1. Added Facebook login for app user. 

2. Added ability to make field not obligatory - end users fields and custom fields http://screencast.com/t/u0t3KrjpxgFE 

3. Removed registration fields in admin of F&B and Shopping gadget. Update F&B  form and user authorization. Now main registration and registration in F&B - the same. 

4. Removed limit of quantity in F&B and Shopping gadget.