Merge pull request #1276 from jbraeuer/master

Berlin 2014: Improve navigation.
Tuned sponsoring levels
Merge remote-tracking branch 'upstream/master'
Sponsor logos first draft
All quotes now straight ones
Merge pull request #1277 from stude1/master

Sponsor logos first draft Helsinki 2014
Proposal from Mikko Paukkila
Fixed logos
Merge pull request #1278 from stude1/master

One more proposal, fixed logos for Helsinki 2014
Merge pull request #1279 from jbraeuer/master

Berlin: Clarified Coffee and snacks after registration
Added O'Reilly as Silver sponsor
Added O'Reilly as Silver sponsor
Merge pull request #1280 from tolomaus/master

Added O'Reilly as Silver sponsor
Change dates on main page
TLV sponsors
Moving Warsaw, New York, and Toronto to the past events.
Ignite proposal by Luca Gibelli
Sidebar layout fix
Added Deveo to sponsors
Fix grammar mistake for TLV event