update sponsors link and contacts, fixes #11
remove duplicate frontmatter
add new proposals
Merge pull request #1124 from kwilczynski/master

Add missing description.
Added Datadog sponsor badge
Merge pull request #1125 from stevepereira/master

Added Datadog sponsor badge
remove identifying info
Berlin 2014: +1 proposal
Merge pull request #1126 from jbraeuer/master

Berlin 2014: +1 proposal
Chicago 2014: Enable registration
Merge branch 'master' of github.com:jedi4ever/devopsdays-webby
Merge branch 'master' of github.com:DevOpsDaysChicago/devopsdays-webby
Merge pull request #1127 from DevOpsDaysChicago/master

Chicago 2014: Add registration page and proposals
Add new Gold Partner: e-Xim IT.

Signed-off-by: Krzysztof Wilczynski <krzysztof.wilczynski@linux.com>