add timetables menu

add 'timetables' view
add 'TimetablesCtrl' controller
add 'perfect-scrollbar' as a new Bower dependency
add 'scrollbar' directive to utilize perfect-scrollbar
update main.scss for perfect-scrollbar and timetables view
update the views directory structure to follow the hierachy of views... need to keep doing this
update 'StringResource' service to provide urlFor function following the hierachy of views
update Gruntfile.js to make 'livereload' watch every view file in subdirectories of 'views' directory
add 'dash/timetables/index' view
add 'dash/timetables/left-column/list' view