Update site/content/events/2013-amsterdam/_sponsors.txt

EngineYard, now the logo
correct name Mies

just to be complete (and to test my new repo on my mac)
New proposal for the talks

Pavlo Baron submitted his talk
Merge branch 'master' of https://github.com/drozer/devopsdays-webby into drozer-master

Conflicts:
	site/content/events/2013-amsterdam/_sponsors.txt