first take on a search based user directory
refactor: UserFinder to search for users

also changed the default to friends
fix search and remove order by login

Order by login was making the queries crazy slow
remove autoredirect on single user search, enable history

using the History extension for backward compatibility
This way previous and next page navigation can be used with ajax
Merge pull request #120 from azul/feature/search-based-directories

Feature/search based directories