added methods for viewing tasks with its methods#178
added the tests for projectuser and issommentcreator#189
adjusted comment model and the tests#189
adjusted project user tests#189
added tests for sprint 0##189
added UMLS#189
adjusted controllers and documentation #189
added new umls #189
adjusted umls #179
adjusted code #189
merging #189
Merge pull request #216 from yousraHazem/c2_nayera_comment_projectuser_tests

C2 nayera comment projectuser tests #216