Updates CONFERENCE_YEAR setting to 2016:
Updates CONFERENCE_YEAR setting to 2016:

This will break various links to /2015 content in the DB.
This change is inevitable, but also is a requirement to make media
asset URL's function properly in staging

PyCon/pycon,njl/pycon,PyCon/pycon,Diwahars/pycon,njl/pycon,PyCon/pycon,PyCon/pycon,Diwahars/pycon,Diwahars/pycon,Diwahars/pycon,njl/pycon,njl/pycon