Merge pull request #18 from AdrienGiboire/master

fix for firefox
Merge pull request #20 from AdrienGiboire/master

feature: add twitter button
fix: remove tickets
fix: Google Analytics
fix: newsletter ref
improv: buy tickets link
fix: early bird batch date
fix: pricing net, brut, VAT rules
Sponsors + Agenda + Fixes
Merge pull request #22 from truepl/master

Sponsors + Agenda + Fixes
improv: add agenda, add partners, small fixes
improv: adjust title to avoid misunderstandings
improv: add RailsGirls
improv: clarify mission statement, change batches
improv: add sponsor, add speaker, adjustments
Merge branch 'master' of github.com:polyconf/polyconf.com

Conflicts:
	index.html