Merge pull request #1275 from kwilczynski/master

Fix incorrect image alt.
Berlin 2014: Improve navigation.

Drop menu items that are no longer useful.
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
Berlin: Clarified Coffee and snacks after registration
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