adds prototypes for list delete, with error messages and confirmations
implements backend hooks for experiment deletion
adds comment
Merge branch 'master' into feature/new_interface_integration_part8

Conflicts:
	ab_tool/static/ab_tool/js/experiment.js
Merge branch 'develop' into feature/new_interface_integration_part8

Conflicts:
	ab_tool/urls.py
refactor to delete track and better failure handling
adds comments
Merge pull request #87 from penzance/feature/new_interface_integration_part8

Feature/new interface integration part8