Helsinki: Multiple new proposals
Helsinki: A new sponsor

XebiaLabs added.
Merge pull request #1334 from jyrkiput/updates

New proposals and a sponsor
Berlin: waitlisting
Merge pull request #1335 from jbraeuer/master

Berlin: waitlisting
add session instructions for flapjack hands on
Merge pull request #1336 from bs-github/master

add session instructions for flapjack hands on in Berlin
Add new sponsor

A new media sponsor.
Merge pull request #1337 from jyrkiput/sponsor-infocrea

Add new sponsor