added some talk titles
link to talk titles on home page
Work on talk and hotel views
Remove useless 'uniq' scope modifiers
Use strings instead of symbols for table names
Modify Accommodation defaut_order
Add a translation for Hotel model
Show participant list on hotel show page
Format
Add scopes to Participation, Participant and Talk
Make Haml remove whitespace in some <span>
Work on hotel show and index pages
Simplify talk index
Work on CSS
Add a CSS rule for "empty" cells
Fix in <iframe> tag
Add a "fake" Participant#web_site attribute
Use dynamic talk and abstract lists in program