C4_Lin_423_View_List_Of_Assignments_4.24

<b>For scenario reviewers: </b>
-Sign in as a student or TA or lecturer
-navigate to to courses then to a particular course.
-you will be able to see the list of assignments in the course. Click on a particular assignment and you'll be able to see the list of problems inside each assignment.
-click on a particular problem. If you are logged in as a student you will be able to see the solution page.
                                                If you are signed as a TA/Lecturer you will be able to edit and also the           solution page 

Please run the commands : rake db:schema:load
                                            rake db:seed 
first as I have changed the seeds.

<b>For test reviewers </b>
 
Make sure you run the command <b>bundle install</b>
and then in the terminal run the commands :- 
<b>rake db:test:prepare</b>
then 
<b> bundle exec rspec spec/models/assignment_problem_spec.rb</b>
and 
<b> bundle exec rspec spec/models/assignment_spec.rb</b>

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#423 @rami-khalil @mimikian @Sharaf93 @fadel1493 @mohamedsaeed93 Please review.