There were several problems:
* Time.now returns the systems time, not the users time
* fixtures do not translate dates from timezone to utc, but stores the
date verbatim
* calling a controller will set the timezone to the preference of the
current_user. So it could be changed while you do not realize this. I
fixed the failing test, but problems could be elsewhere
* new menu item in view menu
* js to toggle view
* store setting in cookie to keep de choice of view persistent
* refactor index and tag page of todos to look more alike
* refactor context and project partials to look more alike
* scaffold.css is only used by login -> rename to login.css
* standard.html.erb is the default application layout -> rename to application.html.erb
* scaffold.html.erb is unused -> deleted
