[openstreetmap/openstreetmap-website] Add banner for FOSSGIS 2016 conference (#1245)

[Bryan Housel]

Looks ok!  Though if it were me I would adjust the image to leave more room for the close 'X'

<img width="793" alt="screenshot 2016-06-23 16 56 15" src="https://cloud.githubusercontent.com/assets/38784/16319982/80a02224-3963-11e6-80d7-a629709fc343.png">


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