Alf.io 1.3

This is the first stable release with embedded jetty and with the check-in application.

bugfixes

#32 update category name doesn't work (admin)

new features

#13 create email sending queue (admin)
#16 redesign/refactoring of configuration GUI (admin)
#25 REST api for check-in app
#34 send invitation e-mail with reserved code
#37 export attendees' data

additionally, the UX on public website has been improved for people using old browsers like IE9.
The Admin GUI has been improved as well, an HTML5 check-in functionality has been added