Update logo of VPNCloud
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Update liulishuo to sponosrship page.
Merge remote-tracking branch 'upstream/master'
Add gotealeaf to sponsorship page.
Add Tuling's logo
Update Intridea's logo
Merge remote-tracking branch 'rubyconf/master'

Conflicts:
	source/index.html.erb