created view and config directory
Extracted util classes
In picture detail, added page number validation, next page number and previous page number
Added redirection in case invalid url is requested
Added PageNotFound template; request dispatcher uses UrlValidator class; path variables are passed via Path object; improved check for previous and next picture and page
removed var_dump
use factory to create views
Pass Path object in stead of separate fields
Merged PageUtil and PictureDetail classes since there were common dependencies
minor changes