Added pipeline user collab logic, no tests yet

created index page and renamed pipelines to pipeline_ngcontroller

no changes

Initial commit for this feature

Collab methods tested and working manually, adding email settings for user ontheir addition to a pipeline

Collab should be good, need tests, add_user_to_pipeline will break without email setting models
Merge branch 'pipeline_collabs' into dev

Conflicts:
	app/controllers/pipelines_controller.rb