add sinatra talk 11/10; update github links

Hello,
  Thanks for the invitation and organizing the vienna.rb meetup.  For your convenience - I added yesterday's talk about Sinatra - the slides/notes are just "plain" text, that is, markdown really (with some images included in the /i/ folder).   I also updated some old github links for the beer talk (e.g. the beer project now resides @ github.com/openbeer, the world.db project @ github.com/openmundi etc.).  Thanks again for organizing. Keep it up.  Cheers.     

PS: Will send a different pull-request for the Planet vienna.rb feed list.