added docblock to ToolConfigView
refactored ToolConfigView for testing
Add .log files to gitignore.  Use django-braces to import a CsrfExemptMixin that allows the Csrf middleware to be enabled.  Integrate csrf exemption into index view.
Merge branch 'feature/integrate_auth_lti' of https://github.com/Harvard-ATG/HarmonyLab into feature/integrate_auth_lti
fix merge issue