Merge pull request #1073 from jbraeuer/master

Berlin 2014: +1 proposal, +1 sponsor.
Remove propose links for Brisbane 2014.
Merge pull request #1074 from mattcallanan/master

Remove propose links for Brisbane 2014.
Moving Minneapolis from upcoming to past.
Merge pull request #1076 from bridgetkromhout/master

Moving Minneapolis from upcoming to past.
Add AWS OpsWorks as Sponsor for Berlin 2014.