truncate wants explicit :length => number and :omission
calling a partial from a js requires to explicitly pass the variable i.e. :todo => @todo instead of rails doing it implicitly
fixes case where unmarking a complete todo which belongs to a recurring pattern results in two todos that both keep on recurring. With this fix a new todo will only be created when there are no active todos left belonging to that recurring pattern
fixes tests that failed because of previous commits
adds some named_scopes, inspired by http://railscasts.com/episodes/108
* fixed redirect to last page instead of /mobile after adding a new todo using mobile interface
* fixed adding new todo to tickler instead of home after marking a todo belonging an active recurring todo complete
