fixed issue #401. remove listeners when scan manager closes and don't update magnet if detector is none
updated ExperimentEditor. added jump, move context menus
exp updates. updated user_notifier and cleaned up executor
fixed data collector
handle git import error
don't add updateplugin by default
exp updates. started fixing procedures
updated procedures concept. #403
fixed setting aliquot from within table
updated executor error messages
Merge branch 'release/v2.0.4' into develop

Conflicts:
	CHANGELOG.md
	pychron/experiment/experiment_executor.py
	pychron/experiment/tasks/experiment_task.py
fixed issue #402
Merge branch 'release/v2.0.4' into develop
updated editor task open