Merge pull request #941 from liku/master

[warsaw-2014] update sponsors document
adding new logo to front page
fixed spelling error; relative path for image
Adding RelevanceLab as Bronze sponsor and Velocity as media sponsor for DoD SV 2014
Merge pull request #943 from mdxp/master

Adding RelevanceLab as Bronze sponsor and Velocity as media sponsor for DoD SV 2014
Merge pull request #942 from tduffield/master

Add new logo to front page of 2014-minneapolis page
new sponsor silver Schuberg Philis
new sponsor silver Schuberg Philis logo
Merge pull request #944 from drozer/master

new sponsor silver Schuberg Philis - warsaw
[warsaw-2014] add banner for silver sponsor