news/maint track announcement: fix table heading
devrooms: add geospatial and search cfps
sponsors: Red Hat is a cornerstone sponsor of FOSDEM 2015
sponsors: Linux Belgium sponsors FOSDEM 2015
devrooms: add more calls for participation
devrooms: add distributions devroom cfp

While here, point security devroom cfp at the fosdem@ announcement.
sponsors: sort case-insensitive
sponsors: trivago sponsors FOSDEM 2015
devrooms: add java and testing & automation CFPs
devrooms: add EDA devroom CFP
index: add more prominent pointers to CFPs
news: fix markup nits
markup: make valid XHTML 1.0 Transitional
devrooms: add ruby, iaas and virt cfps
Add Desktops DevRoom CfT

Added Desktops Devroom 2015 Call for Talks
sponsors: Elasticsearch sponsors FOSDEM 2015
sponsors: prettify the main page sponsors graphic

Add a bit more horizontal and vertical space between the logos
programmatically.  Trim excess whitespace from the small MySQL
logo -- the code provides enough space.
devrooms: add Go and PostgreSQL CFPs
devrooms: add network devroom cfp
sponsors: update O'Reilly logo