specs for admin creating, viewing, editing, and deleting cohort
added students and group content to cohort show page spec
added cohort id to edit_cohort_path
added user story info and edited per Erics suggestions
added delete and edit user stories
merged conflicts
added spec for viewing cohort show page and merged models
controller created
tests are green without authentication and signin functionality commented out
incorporated Erics edits
Merge pull request #3 from TechnoAlchemist/cohort

specs for admin creating, viewing, editing, and deleting cohort