timer's color test
test cleaning
sortable list of exercises
[68067968] Added program details page
[68067698] Added category labels to exercise list
Merge pull request #15 from ComputerScienceStudents/68067968_exercise_detailed_view

68067968 exercise detailed view
/edit for programs + authorization
edit button for program's creator
frame for sortable elements
fixed jshint violations
Merge pull request #16 from ComputerScienceStudents/68068014-edit-program

68068014 edit program
reverted timer controller method
Merge pull request #17 from ComputerScienceStudents/unit_test_is_a_must

Unit test is a must
merge with master