Update SpringOne2GX 2015 banner
Update SpringOne2GX 2015 banner

Fixes the conference and end of early bird dates.

amit-siddhu/sagan,BHASKARSDEN277GITHUB/sagan,TabberGit/sagan,dsyer/sagan,dlizarra/sagan,amit-siddhu/sagan,amit-siddhu/sagan,dlizarra/sagan,BHASKARSDEN277GITHUB/sagan,vizewang/sagan,vizewang/sagan,dharmaraju/sagan,BHASKARSDEN277GITHUB/sagan,eonezhang/sagan,andriykonoz/sagan,mbateman/sagan,yhj630520/sagan,spring-io/sagan,mbateman/sagan,andriykonoz/sagan,lowtalker/sagan,yhj630520/sagan,martinlippert/sagan,lowtalker/sagan,dkushner/sagan,dvaughn555/sagan,eonezhang/sagan,lowtalker/sagan,dsyer/sagan,yhj630520/sagan,BHASKARSDEN277GITHUB/sagan,martinlippert/sagan,vizewang/sagan,martinlippert/sagan,spring-io/sagan,amit-siddhu/sagan,dkushner/sagan,eonezhang/sagan,dvaughn555/sagan,andriykonoz/sagan,mbateman/sagan,dkushner/sagan,spring-io/sagan,dvaughn555/sagan,TabberGit/sagan,lowtalker/sagan,dvaughn555/sagan,dlizarra/sagan,TabberGit/sagan,martinlippert/sagan,dsyer/sagan,dharmaraju/sagan,dkushner/sagan,eonezhang/sagan,andriykonoz/sagan,vizewang/sagan,spring-io/sagan,dharmaraju/sagan,mbateman/sagan,dlizarra/sagan,TabberGit/sagan,dsyer/sagan,dharmaraju/sagan,yhj630520/sagan