Merge pull request #238 from yousraHazem/development

Merge sprint 1 work into master
Fixed destroy group bug, fixed show view, added error reporting for groups form and added documentation for changes. #279
Finished the first three tasks of the story #279
Update groups_controller.rb

Updated the documentation in groups_controller.rb related to issue #279
Update groups_controller.rb

Updated documentation in groups controller
Update groups_controller.rb

Updated documentation
Update groups_controller.rb
Merge pull request #346 from yousraHazem/C4_S1_reopen_create_group

C4 S1 reopen create group