add 36kr to media support section.
add Locomote as silver sponsor.
Merge remote-tracking branch 'rubyconf/master'
markup speakers page(hide the schedule timeframe).
markup sponsors page, content change is needed.
Update the contents of speakers list
Merge branch 'master' of github.com:pragmaticly/rubyconfchina.org
sponsors layout
add topic summary
polish speakers page text styling.
Add sponsor Jagarr
add infoQ as media supporter.