Remove /users paths for now, since there is currently no user management
Move page with lists of tasks to /all rather than index
Fix link to all tasks page
Change links in sidebar to use _path rather than controller and action
Move welcome page to tasks index
Remove old welcome route
Destroy old welcome controller, since all functionality is now under task
Add template inheritance to task views
Add login/logout links to top nav
Remove redundant flash messages from application template
Make row layout consistent between homepage and task pages
Fix redirection after task completion, which was still pointing at old welcome controller