Added Omniauth config/initializers, removed skipped omniauth callback

See merge request !321

Change destroy method, only owner user can destroy collection

See merge request !319

# Conflicts:
#   test/controllers/v1/collections_controller_test.rb

Added collection update test

See merge request !317

# Conflicts:
#   test/controllers/v1/collections_controller_test.rb

add remove collection item

See merge request !314

Populator merge

See merge request !320