Add index to facilitate locating step definitions
Remove 'Title' heading above task list
Fix problem with Mark Complete buttons (1 test still fails)
Switch to Puma web server
Add tests for mark_complete() method
Require update from edit page to redirect to show page; uncomment last step of 1st scenario
Change definition of 'I should stay on the to-do list page' to stipulate root path
Have mark_complete redirect to root_path
Redirect mark_complete to main page on failure
Revise spec: mark_complete redirects to root path not tasks path
Update add-dashboard to incorporate recent improvements to total-do-over