added conditions to sign_in and sign_out specs
moved user creation out of sign_in helper
added days_left to todos.
removed days_left row from todo, added as a method instead. Included days_left on todos#index
installed timecop
spec for todos destruction
rake task to destroy expired todos
changed rake task to reflect structure in blocitoff example
moved remove_outdated_todos to its own task spec
Merge branch 'days-before-destroy'
installed pundit
added authorization for todos: new, index, create and destroy
removed todos#show, as this is no longer needed